There was a mark1 sonic cat leg that was used in my Prout Quest31, it had a crash gearbox
built-in. This model is bullet proof, just cannot break it. A little heavy though. Later on they introduced the mark2, without the gearbox
, a lot lighter and designed to break(yoke) when run into a solid object, I guess to avoid expensive damage to other parts or structural member
, but from what I here it doesn't take much to break the yoke,And they have to be shipped from UK.
Your best bet maybe to get them shipped from UK.
What about putting in twin yanmars with saildrives!!...costly but but what a joy, in harbours and marina besides you would get hull speed
a lot easily.