We had a similar situation with similar boat (2007 Liverpool with Isuzu 42) in June, went into Portland Basin dry dock, Ashton. They had a bit of a job to get it off, even with a big hammer So can't imagine getting one off whilst still in the water.
Ours had 2 bent blades & was sent to Crowthers, came back like new though we've been told it probably wouldn't take another refurb. The spline was drilled & a split pin added when it was put back on as another boat a few days previously had the prop fall off at the lift bridge, don't know if anyone's recovered it yet !
We claimed on our insurance, craftinsure, who were very efficient & paid up quickly, can also highly recommend Portland Basin dry dock, brilliant service.