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I'm not sure how the mechanics of a 200 km wide comety like object hitting Mars at ~25 km/s would work out, but I'm reasonably certain that it would result in a major resurfacing event. I'd venture that the majority of the gasses would retain escape velocity following impact.

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Well, since we’re just assuming we could meaningfully change it’s trajectory we might as well also assume we could slow it down!

Slowing it down would take way more energy than just nudging in a different direction. You might be better off trying to break it up into smaller pieces.

Taking notes.... Small pieces... uh ha, yep got it,.. Slow it down... yep. What else?

Make sure they hit at a safe distance from our Mars rovers, I like them.

how would we aerobreak it in mars's atmosphere into a decaying orbit, so instead of slamming into mars, it breaks up and rains down on mars? What can we tell about the composition - a solid rock or icy rubble?

You get it into an orbit that will have several close encounters with Mars or other planets with atmosphere and you do a bit of aerobraking/thrusting on each pass.

The martian atmosphere will have a negligible impact on a 200km wide object. Tidal forces would likely shred the object and the surface of Mars if an aerobraking maneuver was attempted.

Shouldn't break by itself with Mars' tidal forces alone?

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