Yeah, buy a 3090, put it in a Ubuntu closet box, set it up as a server, and let it rip. It’s really not hard or expensive.
I’m tired of people trying to force a square peg (MacBooks) into a round hole (ml compute). Apple needs to get on board with making it easier and more cost effective for people to access compute more effectively. Developers are jumping through hoops to accommodate apples business goals of locking you to their ecosystem.