My guess, which is well worth what most opinions cost, is that the game ROMs for both RFM and SWEP are contained within the custom Nucore software operating on the freely available Ubuntu linux operating system.
The use the game ROMs likely requires a license from the current owners of this IP. The original system uses
a "Prism" card with a daughter board of the game ROMs. The Prism card is the weakest link in the P2K system. It's a custom design that fits in a PC expansion slot. When it fails there are few who can make an economical repair. The key word in the last sentence is "economical." A NOS Prism card is in the $700 range, where the Nucore system was in the $1,000 range. Plus Nucore had added features and improved play performance.
The folks associated with Nucore are silent on what they need to do to get back into production. Last stating they needed to legally take care of the pirated version Pinbox which is no longer officially available, before they would move forward with anything more to sell.
What if the new system had owners of either the RFM or SWEP ROM boards were presented with an option to where they can off load the their game ROMs into the new operating system using a USB adapter.
There's probably more to the licensing than the game ROMs, but who knows. Why is this such an apparent secret?