As you probably know, George Howard's Hebrew Gospel of Matthew 28:19 only has the word "Go" and a Coptic manuscript also supports this reading.
See Budge, E. A. Wallis. Coptic Texts, Volume V: Miscellaneous Coptic Texts . . . London: Museum, 1915, p. 637.
I believe a better wording of that text would be "Go to them".