Gazza M A broad spectrum purge of the federal bureaucracy is the substance of the Project 2025 initiative, which you'd think is something Trump would try to put into action, though I'd be curious to see how committed he'd actually be to it. I don't think that's outlandish.
What I'm suggesting sounds sensationalist is the claim that Trump would hand hiring and firing authority to third parties such as Musk.
I think Trump would be more likely to jealously guard that authority and only use it on behalf of vested interests based on specific agreements. There could however be some de facto agreement between Trump and Musk, or with other holders of capital about the Cabinet selection, or about the removal of specific regulations or officials, or the award of specific major contracts, and so on.
I really hope Trump doesn't win. I think a Trump victory would be very damaging to US state capacity independent of its uses. And I get the sense there would be less resistance from the establishment than there was in 2016.