Yes, the extra interactions with Wade only happen if Lena has been cheating and intends to keep it up, so it wouldn't really make sense to bring him up in the scenario where nothing between Lena and Wade occurred (the 'pure' Lena/Ian path)
Regarding the trinity, i'm not sure -- from the code, it seems that it's possible to have mmf talk and the trinity as long as Lena has been cheating, but it may be unintended side-effect of how the paths are arranged atm. In theory, if Ian has left the possibility of trinity open and Lena has fucked Axel in Ch.12, the trinity talk will be delayed until after this scene. Theoretically, as long as Ian stopped thinking about Gillian he may be able to activate the trinity at that point, once the currently missing branch (Lena/Ian, trinity pending during the evening) gets implemented. But it's just as likely that Lena entangled with Axel will block the trinity from happening.