If you have certain things like UI options and color match and other things gated the way you have, the FTP option is nothing but a punishment. Gate content if you want. That makes sense. But even with this talk of "Preferred Status", you need to seriously reevaluate what the model does and does not restrict if you think people are even going to bother with it.
The UI and Color match/hide head slot do not restrict any ability to play the game. They are ease of play or cosmetic. You don't need anymore than they are giving players to actually play the game.