Baz,
If anything, this rim was drilled for a larger hub. It would have to either be a wider hub or a larger diameter (not likely on that one since the CB750 is a huge hub). That's the only way to make the angle correct since the nipples are angled too far out of the rim. Anyway, if I read you right you're saying you'd be more worried about reamed/re-angled holes than about the curving spokes as they are now? If I get a chance I'll take it back off the bike and give it another once over and maybe call you this weekend sometime. Been working late these evenings and haven't had a chance to do anything to the chop lately.