I'd recommend doing some reconnaissance by looking at the 32 bit driver. What does the package contain? Prod at any binaries with binwalk, strings and maybe eve

I'd recommend doing some reconnaissance by looking at the 32 bit driver. What does the package contain? Prod at any binaries with binwalk, strings and maybe even Ghidra if you can to try to gather information. If you don't understand the higher level bits of what's going on in the driver, it leaves room for a gap in understanding what exactly you might need to write to replace the 32 bit parts of the driver. If the driver works with cups, it'd be good to try to understand how exactly that works. (I'm being somewhat vague here since I don't personally know.)