Only way I see to do it is go all-in and we know that's not happening. By "all-in" I mean trade Rosario and the farm system for Realmuto (who apparently is Bench/Carter/Posey rolled into one) and then sign Machado to play SS which is just living in a Fantasy World as the Mets would never outbid the Yankees, etc for his services.
I wouldn't say never, especially with Hal, not George, in charge now. They've shown a lot of restraint in spending this offseason. Some fans may even argue they're being too cheap. I don't think the Yanks will be the highest bidder for either Machado or Harper.