Relocate central air conditioners to roof
I like it! On the roof isn't enough, let's put it on the roof of the roof's bump-out room. NICE!

Then, you'll need to add a tiny access bump-out on that roof...just a cherry on top of my thinking, instead of hauling out a ladder.

Yep, you're good to go and any structural issues could be fairly cheap and quick for their few hundred pounds by just doubling-up the rafters...pretty doubtful it would be needed.

It's definitely pricey and quite involved, but can absolutely be fully accomplished. You could even do a pretty little widow's walk style fence up there to beautify it. Not impeding air-flow is important, but shading the sides from the Sun is a performance and efficiency booster.