I'll have a go at it tonight to see if I can get this to work, and if I do maybe I can put together a readme/instruction set for XP users. Don't even worry about it anymore, I would never expect you to go through that much trouble for someone who doesn't need it that much.
After all, XP + SH4 1.5 works fine for most, it's just that I (and probably others) need those drivers because of issues in other games Nvidia promised to fix in this release. I'll report any findings back on this forum.
Best of luck.