I can't see the traditional engine hoist idea working out tbh unless you're handy with a welder and have some engineering facilities to hand. A 'swivel lifting crane' might be a better option eg https://www.rockmachinery.co.uk/product/1000lb-swivel-lifting-crane-with-winch-3/
Have you also considered searching google for the following:
swivel lifting crane
Davits for tenders
Davits for outboards
Cargo booms
eg https://www.lifting-products.com/pr...88sqycnupp8lq4xlr2qbzbyvfpwbypexoc0waqavd_bwe
I certainly will do,but can you see the photos I includes? the hoist there is a swivel one, fixed to the ground,not a traditional engine lift.