Re: Apparently I'm not meant to have a boat...
We have, in the past, fabricated a temporary outboard mount in order to get a boat home where it could be more easily worked on. This might be an option for you even if only to get the boat home... for that matter a couple of hundred bucks for a good mount, 4 holes and a backing plate and you're on your way. It can be removed and the holes filled and faired post repairs.
It could also be something as simple as a couple of 2x6s clamped to a swim ladder...
1984 Fast/Nicholson 345 "FastForward"
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)