A friend of mine who used to single hand his 42 footer fitted a less-expensive tiller pilot, a number of years ago. He had (or built) a little bracket that would clamp onto the ss wheel, and then the TP would drop onto the pin, as tho it were on a tiller. I recalll his bracket being simpler, tho.(?)
Note that in calm seas, it takes very little movement of the piston to steer the boat, so it worked pretty well in practice. Obviously it could not move the wheel a lot.
Your picture kind of reminds me of this attachment. Perhaps.