Hmmm, this is a conundrum in deed. I think what you want to wind up doing is "slip-streaming" the .sys file into the ISO. It's a pain, but this guy sounds intelligent.
https://www.youtube.com/watch?v=sX00GfPyh_k
I have had a situation where I've done this with upgrades. A lot of the time windows updates include the actual thing you needed like yesterday.
I'm having my own install problems with the new Rocky 8 iso (from ADSK), so I'm kid of stuck in my own rabbit hole, else I would try to be more helpful.
I think you mentioned the 'Nuclear Option' before, as in enter BIOS setup and reset everything to defaults (then power cycle). You can always take the MB battery out, has the same effect, cleans up all BIOS setting. Make sure to reset you're date and time on reboot. I forgot once and got a banner ad for Earth Wind and Fire on nextboot. 😉
I know for sure nothing likes booting from a RAID.
After that, you could try to open a ticket with HP, if you haven't already.
I wish I could be more help. Slip-streaming drivers is the R&D focus.
Keep us posted,
--------------------Beak