I second the Kato davits. Too bad they cost too much. Not sure about that weight thing. I hoist my big dink (11.5' Achilles RIB) with no problem without the engine. After looking at it recently, I'm impressed with the way it integrates into the coaming with an "L" shaped bracket. Also that way someone (maybe not them, might be that way from Beneteau) put angle braces from the top pushpit rail down to the bottom of the sugar-scoop.
Great minds discuss ideas;
Average minds discuss events;
Small minds discuss people.
The best minds discuss sailing.