It is almost impossible to right a catamaran without the rig on it. The only one I've ever seen done is a Hobie 14, and it took two guys to do that.
I can testify to that one. De-masted a Hobie 14 in Hurricane Gultch (Long Beach Harbor) on my third attempt at rounding the weather mark. Lost the rig. Even with a power boat, it was nearly impossible to flip the hulls and tramp back over. Try it on dry land sometime. In water you sink and the boat slips away from you. A mast (and raised sail) is a giant lever arm and or kick stand.
At least on a 14 you can sink a corner and start the rotation. A Hobie 20 has too much volume far aft and far forward. As does the Hobie Wave. Back when we introduced the Wave, we took it to Club Med in Hualtuco Mexico (at the H16 Worlds). The club staff quickly tested something we had not... righting from Turtle. With both Doug and Myself standing on the transom... we could barely get it back over and righted. That is the day of conception for Baby Bob.