Menno,
About 10 years ago a friend took 2 AXI motors, one with a hollow shaft and made a really nice motor with the props contra rotating. We put it on a model simular the Convair XFY Pogo and were able to take off and land without any problems on the tail. The lack of torque made it pretty easy to do and didn't have to have huge surface deflections to get the job done. Spektrum has a new set of receivers with stabilization that I want to go back and try and fly it again but I unfortunately gave the motor away.
The large pancake motors that are made to have a slipring in the middle should be good candidates but would have to be rewound.
Max,
I didn't want to have to add another four motor drivers so I just put them in parallel. Not very efficient but it flew fine. It weighs close to 70 grams with battery so when all four props were off it was struggling but controllable. I pulled off each prop one at a time and it just got a little weaker each time. No control problems at all and it was just our normal Quatos.