I'm sure you've already thought about the option of releasing cut-down SFW versions of your (current and future) game(s) on Steam and hosting a "content restoration patch" on a third-party site? Seems to work for a lot of devs and Steam gladly turns a blind eye as long as you're not too obvious about the patch.
I'm not sure whether that option is still on the table for MIST, though. I've seen a handful of games that got rejected by Steam, tried to get onto the platform again as a SFW version and then got shot down again. Seems they're wary of you if your game has already been rejected once.