From Reuters:
"Jonathan Compton, partner at law firm DMH Stallard and a specialist in competition law, said it was difficult to see what structural alterations the company could make. 'Were it to do so, it could face fresh inquiry from the FTC and or the Commission,' he said, of the U.S. and EU regulators. Euclid's McGrath added: 'how do you reset the clock just for the CMA process without resetting the clock everywhere?'"
So I wouldn't be so sure Microsoft could draft something just for the UK that wouldn't draw fresh inquiries elsewhere. Seems like it's a lot of uncertainty from here as things move fast. Really nobody outside of Microsoft and ABK has any idea how important the July 18 deadline is, so that's sort of a wildcard factor as well.
It really is remarkable how quickly we moved from "The CMA is the real test of this deal, if they block it the deal is pretty much dead," a few months ago to "the CMA can be ignored, sorry UK gamers." I think the best approach here is to listen to lawyers. Not sure anybody else really has a clue how this plays out.