If I recall that wing keel mfg. by Mars Metals was solid lead, not cast iron. Not sure about that but adding epoxy barrier coating will not hurt that and then of course anti fouling paint and would suggest checking locally to see what works well.
As for the keel bolts, if no water is coming thru, the best way to handle that is to leave it alone,.
Even though there is a hinged mast step, there was no supplied nor offered mast raising system for the boat as the mast was too heavy. I use to be a dealer who introduced both versions outboard motor/inboard diesel engine many years ago at Annapolis and sold quite a few as a dealer. Yes I did make a few mast raise systems for boats to include this one but due to the weight plus now being retired, I will not offere any advice on that.
As for transport, I had a mfg. build a specific trailer for that boat which I pulled with pickup truck either dooley or standard but with diesel or a heavy duty gas engine.