RE: Veteran Member ????
I left a comment there.
I am thinking that maybe I could do something like your set-up. Turn it into a motor sailer. It all depends on how the cabin is made. I would have to have a structural member just behind the center of lateral resistance - which is easy to find. After that it's simple. It would steady the boat out under power and also assist the power. Then I could look really cool like you, well almost.
Somehow, buying an older boat like I would be looking at, a set of sails and a mast would be low on my prioprity list.