There’s no chance of it making it in for 3.12. Not only has this PEP not been sent to the SC yet to even consider accepting it, there isn’t a working 3.12 patch to even begin reviewing (GitHub - colesbury/nogil: Multithreaded Python without the GIL is 8824 commits behind main as it is).
No because I don’t even necessarily agree it’s an interpreter-level tag difference compared to an ABI tag difference. And I personally don’t want to expound the energy on that debate unless it’s going to be useful (and my active COVID recovery says it wouldn’t be at this time).