In this attempt, I assume that the current parable is distinct from the one in Luke 14.
8Then he said to his servants, ‘The wedding feast is ready, but those invited were not worthy. 9Go therefore to the main roads and invite to the wedding feast as many as you find.’
This was a second invitation, an on-the-spot spontaneous one.
10And those servants went out into the roads and gathered [G4863] all whom they found, both bad and good. So the wedding hall was filled with guests.
May we presume that as they were gathered [forcibly?]
I don't think they were forced. On the contrary, the context says that they were invited. Furthermore, the dictionary meaning of G4863 also bears this out.
4863 sunagó συνάγω
The first part σύν means
identified with, joined close-together in tight identification;
σύν gives a nice connotation of cooperating together.
The second part ἄγω meaning to bring.
So συνάγω means to bring together (nicely).
a. to gather together ...
b. to bring together, assemble, collect ...
c. to lead with oneself namely, unto one's home, i. e. to receive hospitably, to entertain
Now about the wedding clothes in
“But when the king came in to look at the guests, he saw there a man who had no wedding garment.
The framework of the parable probably pre-supposes the Oriental custom of providing garments for the guests who were invited to a royal feast. Wardrobes filled with many thousand garments formed part of the wealth of every Eastern prince
The king provided wedding clothes free of charge.
12And he said to him, ‘Friend, how did you get in here without a wedding garment?’ And he was speechless. 13Then the king said to the attendants, ‘Bind him hand and foot and cast him into the outer darkness. In that place there will be weeping and gnashing of teeth.’ 14For many are called, but few are chosen.”
The first batch of people who were invited was called by the king but they didn't show up.
The second batch of people who were invited was also called by the king and they showed up.
The chosen ones were the ones who remained in the wedding banquet to the end because they were dressed properly, clothed in righteosness.