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This is a tangent, but in the first question post the OP mentions considering implementing helper circuitry with quote "a GAL16V8 or something but I don't think I understand them well enough, programmers are very expensive and the programming software is closed source & Windows-only as far as I know."
I went down this path on a project a few years ago and I just wanted to point out that you can burn the fuse file for the Lattice GAL16v8 or GAL22v10 chips these days using a cheap TL866 Plus programmer...
And there is a very cool way to write the JEDEC fuse files- you can draw out the circuitry you want using the [0] Digital simulation package (it is similar to Logisim) and export a compatible bitstream to burn from there. Thus skipping the need to find a way to run the old WinCUPL or the even older DOS program that was used to do the synthesis back in the day.
[0] https://github.com/hneemann/Digital
Used the recommended JRT https://adoptium.net/
Wandered through the https://github.com/hneemann/Digital site and saw past issues with JRT but no obvious solution.
I have a couple hundred GALs of same or similar model number of new old stock