There are already PPC laptops. "PowerBook" and "iBook" should ring a bell.

Drop the hardware distributor license requirement nonsense, port AmigaOS to a few PB/iB models, and sell shrinkwrapped copies of AmigaOS. Problem solved.
Maybe some third-party vendor would even like to sell licensed Mac/AmigaOS bundles, if so, great. But that's unlikely to happen and nothing to expect or depend upon. And the rest of the Mac market, including the second-hand one, shouldn't be removed as an option for AmigaOS users.