I know of at least a few places that do/did sort of a globally averaged salary - their rates aren’t adjusted for location, but if you’re in a major North American city you might be disappointed. If you’re rural, or in less expensive parts of the world, their salaries were well above market.

Tax domicile is a real concern. The BigTech firms are smart enough to know and care where your actual legal residence is, and presumably they’re not going to let you pretend to be in SF to collect SF-adjusted wages while actually living in Michigan and collecting their legal benefits.