The Aikido-L mailserv folks have (I believe) had two seminars where everyone on the list -- from widely disparate styles -- were invited. I went to the second, which was held in the Virginia suburbs of DC, and it was great. The seminar was structred so that one teacher from each style represented had a 2-hour class. There were (if memory serves me correctly), sensei from the Ki Society, Yoshinkan, Aikikai, ASU, and some offshoot of jujitsu/aikijujitsu. The theme was "celebrate our similarities", not differences, and everyone had a great time.
So, it CAN work.