Sadly, I doubt that "Hackintosh" on ARM will ever be a thing. Like Bootcamp, It worked because, up to 2016, Intel Macs were pretty much PC clones with nice cases and trackpads, using mostly PC hardware - so MacOS had drivers for Intel disc controllers and GPUs, AMD GPUs, Broadcom sound chips etc. Apple's T2 chips changed that somewhat by taking over a lot of functions like disc controller, but pre-T2 Macs were being sold until 2020 so "generic" Intel hardware is still supported - but the only thing supported on ARM is the Apple Silicon System-on-a-chip.What if one of the ARM-64 CPU makers (such as under license from Qualcomm) were to begin offering a DIY ARM ATX desktop motherboard that could at least run "bare metal" Windows ARM-64, as well as potentially dual-boot macOS? Thus allowing for a Hackintosh running on ARM?
The writing was on the wall for Hackintosh anyway with the T2 chip - that clock started ticking when the 2020 T2 iMac was released.
It's not just the instruction set - most of the functions done by generic PC hardware on pre-T2 Macs are now handled by proprietary hardware on the Apple Silicon system-on-a-chip - AFAIK there aren't even any ARM graphics drivers for anything other than Apple's GPU. Plus there's the secure boot system & "secure enclave" on Apple Silicon chips that MacOS-on-ARM requires.There has been mention of Apple using unpublished calls for their ARM instruction set.
Didn’t they have something awhile back where you had to scavenge from a Mac (I think it was a ROM chip?), BUT you could then run Mac software on it… maybe it was just a dream?
No, you're not dreaming - there were products like that for the Atari ST and Amiga (since they all used 68000 processors): https://en.wikipedia.org/wiki/Spectre_GCR
...but that was back in much simpler times, before Apple was making its own processors... and when MacOS was MacOS, not son-of-NeXTStep.