Well, I tried PRNDRV, and it was unable to fix all the broken parts of my install.
I'm continuing my experiment on my Warp 4 system. The MCP system will be restored to first boot and rebuilt. (Snapshots on VirtualBox make this easy)
I got a little further with Warp 4, but the import of the PPD fails. This is a built-in PPD from hplip installed from Netlabs stable respository.
I thought about the failure, and then ran CUPS.PDR through PMDLL (Because I know a PDR is a kind of EXE). I do this on ArcaOS, and I get UCONV.DLL depending on UCV32.DLL. There is no UCV32 on MCP or Warp 4. Can you help me find a copy of the up-to-date UCONV.DLL and UCV32.DLL?