I don't know if you have any contacts that have been around for a while?

You may be able to get a 24H old Zipp rim (340 or 440). They can be built 16/8 x2/radial on a 32H hub. I've seen them for as little as $100 street price. In fact, I'm trying to get my hands on a pair from an old teammate who doesn't want tubulars anymore, specifically to build for my track bike.

Obviously any 24H rim will work on a rear 32H hub, but the old Zipps were plentiful and shouldn't be too expensive. They were the first commonly available rim, and they came in 24H since they only sold rims for a while (their original hubs were pretty bad).

cdr