I think I’ve never done an Intel board NVMe mod…as far i can remember…but since you have backups and a programmer i think you’re safe to test anything.
The most experienced user with these bioses, usually is @IntelModder
Here’s the 061 NVMe, since it was only NVMe DXE insertition i think you only need to program back this W25Q32BV as it contains the DXE drivers volume and the new NVMe, mcodes and ME are in the W25Q64FV and were not touched.
Follow Fernando’s guide for verification/clean OS install on #4 and report back for future user guidance, please.
If it works, optionaly you can later manually update the ME FW v8 (5Mb) to the latest 8.1.72.3002