Joined: Jan 2009
Posts: 44,193
Likes: 6,430
From: New York, NY, and High Falls, NY, USA
Bikes: 1962 Rudge Sports, 1971 Raleigh Super Course, 1971 Raleigh Pro Track, 1974 Raleigh International, 1975 Viscount Fixie, 1982 McLean, 1996 Lemond (Ti), 2002 Burley Zydeco tandem
I'm offering to trade my 26" mtb rims, not 650b, in case that isn't clear. I don't own any 650b's.
Also, I do city riding on lightweight wheels. You might be able to, also. I used to commute on tubulars! That was when NYC potholes would win awards.
And rhm is right about custom frames. They're really not worth it.
As far as I know, only a very modern cyclocross frame would satisfy all your parameters, but I think you have too many parameters.