The only potentially serious problem to be addressed is a frozen rudder. Using the wheel above and putting pressure on rudder below because she is on the hard, the rudder refuses to move at all. ...The rudder neither turns nor can it be dropped. Thanks.
Well, this brings back nightmares! I had a similar experience with my 1983 Nonsuch 26, also built by Hinterhoeller. I have no idea whether your boat is constructed the same way mine was, but I'll give you the short version of my experience.
Wheel was getting harder and harder to turn. One day I came back to the boat (in the water) and the wheel was completely frozen. I figured the rudder shaft needed more grease, so I used the emergency tiller to "break free" the rudder and added grease. Seemed to work ok after that and I sailed the rest of the season. It was only I pulled the boat for the season I found out what the real problem was.
The rudder shaft goes throught a fiberglass tube called the rudder log. The log is held upright by three plywood struts and surrounded by fiberglass tabbing. Where the tube meets the hull there is caulk.
In my case, the log had completely seized on the rudder shaft. When I "broke free" the rudder what actually happened is that I broke the connections between the log and the plywood and fiberglass supports. Rather than the rudder shaft spinning freely inside the log, the shaft and log were spinning as a unit inside of the fiberglass tabbing. When I added grease, it only went between the log and the tabbing.
The fix: Contractor had to drop the rudder, rudder shaft, and log as a single unit out of the boat. They had to use a press to get the shaft out of the log. Because of grease contamination, they had to tear down and rebuild the plywood supports and tabbing.
It's now better than it was when it was new. But it wasn't an easy or cheap fix.
I hope that your problem is different and can be resolved with much less effort.