About your rudder, I had a similar problem when I purchased my 1986 Attalia. Mine was such that the rudder was full of water The surveyor noted that my rudder was full of water and the insurance company would not let the boat back in the water until it was fixed, that means that I did not get to sail the boat for the rest of the season, very frustrating.
I hired someone to fix it but can share what I've learned from the process.
First, it was difficult to get the rudder out, my boat sits on a cradle and there was not enough clearance to get the rudder post out, they had to "block" the cradle and dig the dirt down under a bit to get the rudder out.
Once the rudder was out, the person took it to its workshop, cut the rudder sideways and open it in two halves and let it dry out for several weeks. Please note that the inside of the rudder was wood, which surprised him. Once it was all dried, he put it back together.
Since I had the rudder out, I replaced the cutlass bearing on the propeller shaft, it was easy to take the shaft out with no rudder.
This was done over the winter (I am on the great lakes) when the boat was out.