Maitimos except Mitros and Space should have no interaction with future Midnights. Mitros and Space think the best approach is to give him a softer out? Like, land, kill Enemy, give everyone free will and then put them back to normal (present this as standard procedure for this type of Arda because most of the residents have been mentally tampered with and deserve a clean slate), explain that his Valar suck harder than standard Valar and ask about landing subtle artists to undo what they can. Midnight will ask what Ardas with less Valar tampering are like, and can get a timeline/overview that makes it pretty clear standard-timeline Maitimos Don't Do The Thing. If unwilling to give out Loki's spells do not do anything with them or even make it clear they exist. Reembody everyone. ...wait and see what he does? Optimistically maybe he just decides that he was only terrible because of Valar vindictiveness and will stop being terrible out of spite; likely he makes himself very busy getting his population up to modernity; unlikely he runs away while that'd mean losing access to resources needed for aforementioned.

Findekános think this all sounds great but that if once things are settled their alt doesn't leave he should, like, be talked to in order to ensure this isn't for reasons like 'worried that if I leave he'll commit ethnic cleansing out of spite'. If it's for reasons like 'the Maitimo zigzagged really hard and decided he only did any of that in the first place because of the evil Valar and is now being an aggressively good boyfriend as only Maitimos can' then that's fine.

Maitimos other than Space and Mitros continue to think the best handling here involves murder.