I don't doubt that for a minute. I am s#*t at ukemi but I have no problem initiating it.Eh, judo and and Bjj take a lot less time to become proficient at than Aikido. About a year's worth of training in Bjj or Judo should yield you some satisfactory results. On the other hand, I've seen black belt Aikidoka not being able to perform their techniques against resisting opponents. And when I say not being able to perform, I mean complete and total shutdown of their ability set.
They have some great ukemi though.

How appropriate would your normal BJJ or Judo be in a psych ward?