I'd be concerned with damage already done, or that could be done, to the
rudder and rudder tube. And if the boat was heeled hard over, with potential flooding through lazarettes or the
companionway.
Finding a barge crane, looking for the next really high tide...anything that lifts the boat rather than using brute force on it. Five hundred bucks to a crane operator may be serious
money, but I guarantee you that it is less than the cost of a new rudder and rudder tube.
Only the OP will be able to evaluate all the details to make right decision.
I think I'd also run off a thick wad of "business cards" of some kind.
Cheap and gaudy and with a working contact
phone number on it and the note that I wanted a barge crane or other
small boat salvage help. Pass 'em around to everyone in the area, so if the right
equipment comes in, they can reach you.