Communication is key, maybe why not adjust yourself to these "new" ast, who obviously might be having a harder time playing that class. I do that multiple times, end up in Castrum or any other 8 man roulette with other astros, I wait to see what sect they activate before I enable my own. As for card override or whatever, that is something that cannot be avoided, you either want both astros simply not using aoe cards at all (and if so communicating and letting the other ast know that aoe is not an option), or you can just ignore the fact that your card got replaced by another one.

If it is not extremely hard content that would require maximizing dps and whatnot, then why bother so much and get so annoyed about something as simply and irrelevant about losing a buff, you will still clear the content.