So a 5001 (et al) is off the table?
http://www.newark.com/keystone/5001/test-point-pcb-through-hole/dp/62W5135Says 0.1" o.d., so they should stack (a little bit tightly) at that pitch. The hole will be a tight fit, but it looks doable..?
Afraid I don't browse test points in detail, so I don't have anything to add that you probably haven't already seen or thought about before, anyway...
Tim