I think this may largely be a non-issue by the time it rolls around, as while software emulation of x86_64 might prove tricky, there's one thing that runs x86_6

I think this may largely be a non-issue by the time it rolls around, as while software emulation of x86_64 might prove tricky, there's one thing that runs x86_64 really well. Actual x86_64 chips. This is what they used way back in the day. Apple (and others) actually made x86 (non-64) add-on cards for PPC Macs that were effectively PCs on a card to slap in a Mac. Would be relatively trivial to do the same now. PC on a PCIe card, maybe expose itself to the host as just a high speed network card. Use a Ryzen embedded chip, SO-DIMMS, job's a good-un. All the major software stuff would already work. Headless diskless iSCSI PC. Bonus feature that it also acts as a hardware dongle if you want some magic sauce MacOS software to make the process easier.