Oh, right, I wasn't really thinking about the damage bonuses tbh. Yeah those should only be for the actual crisis; I was mostly spitballing making opinion and diplomatic changes that would come up more often. I feel like ascension perks should have some kind of impact on how you're playing the game, and as it stands Defender of the Galaxy... doesn't. Giving it diplomatic effects that trigger in some other total wars or one aggressor vs. everyone else situations makes it relevant over a larger period of the game and has it impact your gameplay options more.
There's no reason you couldn't have the damage bonus only apply to the endgame crisis while still having other effects for non-crisis threats.
I generally see it as a bit of an "Oh shit" button. If a player crisis takes off, or the endgame crisis is killing everyone, you can grab the perk to give you a leg up.
I could see some mechanics like "you will join in on any war against a crisis empire", or cheaper/more guarantees of independence. But I think the diplomatic side of things should be as much obligations as bonuses: you are claiming to be the defender of the galaxy, now back it up.
Alternatively, could add bonuses whenever you kill crisis ships so you are just mechanically incentivized to fight the crisis. Unity or opinion seem the best options for that.
Stuff like "increased diplo weight in the GC for these specific votes" is way too specific imo. I think it would make sense to add an Ascension Perk about better influence/control in the Galactic Community, but I don't think Defender of the Galaxy is the perk for it.