ASTEROID M
I had thoughts. So okay, Nick's got some mutant agent spies on the asteroid. What if they are helping to fuel the underground rebellion. Then it happens and during the fighting and stuff would be an opportune time for a "rescue mission" of Pietro and Maggie.
We were searching for a planet, yes (though to be honest, Mags kind of likes the power he has right now and that whole "we will all die if we don't work together" threat, so he maaaay not have been looking as hard as he should have). As for actually crashing, I think basically Mags would lose control for a bit of the trajectory and they'd crash, but like I think he'd get it together in time to get his usual shields up to shield it as it crashed landed. There could be some casualties, sure, and that could add to this sort of dissent towards him because Magneto will simply never have his Utopia.
Is this a thing we want? Otherwise we could just have them find their planet and then have a rebellion happen, though Asteroid rebellion seems all dramatic~.