Glorifying God with Culture?
I don't think the hermeneutical issue pertains to grammatical-historical approach, since it is not about the original context, but the broader implication and rather closer to the Paul's advice on the cultural conflicts pertaining to food, meat, eating in the idol temples and observing sabbath, new-moon etc. In this case, I don't see any conflict in your practice of observing your cultural drums, beaded eagle, beaded cross. The eagle is already a national symbol of the Christian America, there doesn't seem to be any objection over it.
The wearing of feathers may look too extreme and pagan. This is where the conflict and doubts start. You are already writing good English, a well-educated man (not a tribal) in which case, there shouldn't be any reasons for you to want to cling to your tribal ceremonial practices. It should be a question to those newly converted and thinking what to do with these pagan objects and idols I'm supposed to burn or have already burned most of them, but thinking about maintaining the eagle and beads and dressing. My question to such people who are anxious about their cultural practices under the Christian (Jewish and European religion) is to find the reason behind it. If you are guided by love, there is no judgment upon minor cultural practice, observing of festivals etc.
There is nothing wrong with maintaining the pagan tribal appearance and culture, it is not going to harm your spirituality if your heart is clean. However, I encourage you to focus on Paul's letters rather than the OT historical passages. Food, artefacts and drums, ceremony and rituals would not commend us to God (1 Cor. 8:8-13). The impression you would give to your weaker Christian or non-Christian brothers while looking like a wild tribal pagan man should be a more dangerous concern worthy of anxiety than the useless objects themselves. Works alone are the fruits which commend us by giving a testimony to others that you represent God. You should be an ambassador of God, not your wicked pagan ancestors, however, it's really a personal matter of discernment and choice and I cannot claim to know your personal situation.
God commands us to hate our mother and father and ancestors (Luke 14:26). I encourage you to question your hatred for your ancestors, and to love that foreign European culture which saved you from the culture worse than Canaanites or any other wicked tribe of the Bible. The restrictions and judgments of others should not a concern to any spiritual man who is free from the bondages of culture and tradition. If you love Christ and want to save others for him, you should count everything as expendable, even if it's legitimate tradition.
I myself have been saved from my ancestral cultures in my nation and would count every little cultural practice as a curse because they resemble those to whom I associate darkness and evil. Think about the reason why the Jews started a law which separated themselves not just by diet, but also the mixing of fibres and appearance. It was to separate themselves from the sinful surrounding cultures as much as possible. They condemned and banned the pagan hairstyles, tattooing, clothes etc in Lev 19, because there should be absolute disassociation with those people. They also commanded at certain wars not to leave a single breathing thing in the midst of the enemies. Have we exterminated and disinfected ourselves with everything associated with our sinful ancestors and their culture, religion? We who are in Christ have no obligation to observe the Jewish days, feasts and rituals, but we should also not have any burden to maintain any tradition especially if it's from demonic traditions.
Imagine if some Israelis would've said that I love their clothes, hairstyles and food, I want to sanctify them, and of course those animals are not unclean in themselves. This person would be ignoring the fact that the animals were counted unclean because of arbitrary reason for their association with the gentile pagan tribes. The unclean animals represent the unclean people of the nations. Now, since the nations along with animals have been considered clean, we should not find reasons to sanctify every single pagan practice and tradition to Christianize them. Such a mentality points to the Marxist world-view of intersectionality and multiculturalism, which cherishes everything counter-culture or counter-civilization. That is everything that go against the common sense and good Christian culture by enforcing anti-Christian values and traditions by pushing pagan and evil cultures of the past, be it the American skeleton mountains that they praise or certain foreign ethnicities. I'd warn against not only the hatred to the European culture which saved us, which is caused by European Marxists/Socialists themselves and also the unnatural love for the dead ancestral practices.
The Roman Church immediately sanctified their Virgin Athena goddess into Virgin Mary, they also sanctified their festivals of drunken debauchery and indulgence. There should be reasons and wisdom behind trying to Christianize any practice. If I were in your situation, I would be grateful towards the European saviours and would incline towards the classical and things of excellence, which means Piano, not the pagan drums and feathers of my ancestors. Circumcision of the heart matters, our intentions and works alone matters. There doesn't seem to be any restrictions of using any kind of drums or instruments for Christian worship, nor there is any necessity of using electrical or acoustic instruments in particular.
The Evangelical Church is distinguished by breaking liturgical uniformity by giving freedom and originality in worship. However, my question of concern is that we, the newly freed pagans should naturally hate our ancestors and their practices due to their association with the sinful sources, and not for the objects themselves, the reasons for which the Israelites were commanded to hate their surrounding sinful nations. If we are constantly gravitating towards our tradition of the sinners, we may not have truly recognized the difference between the American tribes with the European Americans whom God used to punish and destroy the tribes.