A workaround for your community might be to not enable encryption in your community rooms

or another workaround is to tell them: if they don't want to deal with the recovery key, that's fine, but then they should treat it like signal where if you lose your devices, you lose your old messages. its fine to most people if they know the consequences of their choices beforehand, I think, and this way it won't feel like an obligation, like a needy app