Another viable approach could be to setup Amiga emulators on old/discarded PCs and repurpose the existing software using wired instead of wireless connections.
The 2M number is probably a major overhaul of every part of the system. Utility bills alone will probably more than cover the difference.
I suggested a US$ 200 PC because many of those have no moving parts and more storage space than any Amiga ever dreamed of. They should be able to easily last 30 years or more.
