Short answer: Maybe, but you should hire a
marine electrician for a review and any
work if you're confused. I have a UK boat in the US, and I had a
marine electrician come review everything before we connected to shore just to be safe.
The easiest way is to get a universal
charger, and run everything off your
inverter. This is the way to go if you're going to be going between
ports of different voltage/frequency. This is also the way if you have any expensive
equipment that won't run at 60hz, e.g. your air con units.
Presuming you want to
power from 240v/60hz shore, and you have a
galvanic isolator, double pole breakers on your circuits, and a 32 amp RCBO/ELCI you may be ok. You'll also need to verify any 230v/50hz
equipment will run at 60hz. Older
air conditioning, microwaves, and washer/dryers all tend to be sensitive to frequency. You also want to ensure your
inverter is turned off while connected to shore, and that the GI's neutral is not grounded on ship side. You basically run split-phase with a floating neutral which is why double pole breakers are required.
Presuming all is good, you can either make a pig tail for the shore connection or cut off the end and add the 50amp plug. You don't bring neutral from shore. Just L1, L2, and ground.
This is what I remember off the top of my
head. I highly recommend you get professional help for at least a review if not doing any of the
work.