Go ahead- rebend it
I sail in very thin water and have slightly bent the rudder on my 1983 Hunter 33 at least 2 times and have straightened it two times. The bend has never been to the point where the aft upper tip of the rudder could not be forced past the princess fairing. The first rebend was accomplshed out of the water as the bend occurred on the last sail of the year. I used a tackle between the rudder and the keel and cradle.The second occurance was at the beginning of my season with several guys aboard for a good day of sailing. I just backed the boat down on a very steep sandy beach that I knew to be rock free. A couple of light hits was enough to get the rudder swinging free. A great day of sailing was had by all aboard.Several years later I have had no further problems. There was no dimpling or wrinkling of the shaft metal so I seriously doubt there was any real "stress" involved. The shaft is solid 1 1/2" stainless steel. It is surprisingly strong. Remember, this is not a 1990's committee designed Hunter. These older boats are a lot more solid than you think. In reality the shaft actualy takes on some strength during the initial couple of bends due to "work hardening". Try bending a wire coat hanger to break it. Well before it breaks it will become very hard to bend, and finaly after a lot of work and heat it will break. The stainless is much stronger and more maleable. I would not trust one of the later hollow shaft rudders with this technique. If you take a shot at this, do your best to hit dead straight on the aft edge of the rudder, transferring the loads in a straight lengthwise manner to the hull. It will take it. You have very little to loose and you might just save your cruise for a while.