If it's a slightly tapered shape with a curved top edge (but no "lip" in the middle), it's also Japanese but an Elitist (or Elite) model.
see, this isn't helping, I just found myself going "I wonder if I could find an Elitist on Ebay and mod it..." :?
Mod it to a Gibson headstock shape, or just mod it generally? Couldn't really do the former, the basic shape of (most) Elite/Elitist headstocks isn't the same as Gibson.
Yeah, they do appear on eBay, but if you're thinking about an LP or SG they don't go cheap - people know they're good, they're not "best kept secrets".
Most of the Elitists which crop up are the Casino models.