The one in question is a 1973 LP Custom, and I have tried it before with a tremspaced Duncan. The older pickup rings just do not like the trem spaced stuff. I agree that it would work, but it is a pain and looks sloppy.
If it were standard spacing, I'd be on it like a duck on a junebug. Oddly enough, I want one for a charvel san dimas clone I'm going to build with a trem on it. The trem is spaced for use with a regular humbucker.