I... don't really understand how the scenario you describe relates to the moves you listed, either in the general or specific forms. Could you give an example of the sort of contribution you mean, and a move specifically for that situation? (I mean, you don't have to; I'm just confused as to what it is you're trying to deal with, and how you feel a move would help.)
To me the general move seems too nebulous, and the specific moves are entirely about character belief (but you suggest that is just a sort of accident, not the goal). If it is clear to the player and/or MC that the PC is totally not able to wrap their head around some new cultural element, why not just use Act Under Fire?
MC: 'The strange people in gas masks offer you the warm heart of their dead comrade to eat... if you want to try to eat it, that's probably Act Under Fire?'
Player: 'No way, I'm totally into it, it's just like I always wished things were!' OR 'Yeah, I am totally freaking out here, but I want to make a good impression!' OR 'Forget this, these guys are barbarians, I refuse.' Depending on how physiologically difficult eating this heart seems to be, the MC could still ask for a roll even if the character has the first reaction, but either way it's about what the character actually does in response.
Like, that sounds like an interesting thing for the player, to see how they react -- and then once they decide how to react, that helps guide what kind of rolls (if any) are necessary. But these example moves seem to want to decide for the player, how it is their character might react, which seems to be missing a pretty big part of what makes playing in the post-apocalyptic setting interesting.