Hooboy. Uh, I started using the word collective to avoid “system” syscourse. If people are taking issue with that too, I don’t really know what to tell you. As far as I’m aware no one has come up with a system synonym specifically for endogenics. (Honestly, because endogenics and traumagenics have been sharing language for ages up to this point without incident.
Maybe something like a mental ‘party’ or a ‘comradeship’. A ‘union’ maybe? Maybe just ‘a shared headspace’?
Honestly, the sad fact is that no term you pick to use is going to appease people who think that you& don’t exist and don’t have a right to exist.