A long overdue winter update! My lab is now operational and there is actual r&d happening :)
I'm happy to report that the JVS-PAC 2 and MiSTer are now friends, and it makes for a very easy and nice setup! I've added a tutorial on getting a MiSTer up and running in the JVS-PAC 2 section. To make things more plug and play, I've updated the default key-mapping for Player 2 Button 5 to "E", which is the MAME standard and also used in Jotego's fantastic cores e.g. the CPS1 - i.e. no complicated merging/unmerging of devices or remapping of input.
If you already have the JVS-PAC 2, all you need in addition to the DE10-nano is an SDRAM module.
For Jamma cabinets, a little more hardware is involved in making the DE10-Nano cabinet friendly, but I'm confident there be solutions for that soon :)
Stock levels are healthy, and I don't expect that to change anytime soon.