So, ⟅ June ⟆ (npub1qrh…zx78), who created Modal, demonstrated to me an interesting connection between Fractran and rewriting programming languages that I couldn't see at first. It is not obvious until you point the registers to symbols in memory, but once named registers defined in rules start to be rewritten, it suddenly becomes a very powerful OISC rewriting engine system, moreso than Thue if I dare say:
https://wiki.xxiivv.com/site/fractran