Is the software still attractive to use, after all those years, or why are you going to these extremes? Sounds it's somehow intimately intertwined with the dongle, if the check routines can't simply be patched.
I have two Falcons here they're a compelling machine and still fun to play with.
But if I were to ask for a machine repro, a new motherboard, it would be in a different PCB form factor to get it into an ITX or m-ITX case. Because it's the cases and keyboards that go, not the machine.
And then this blew my mind:
https://re-falcon.com
Quite the underground scene:
https://indyclassic.org