Can it be done? Technically yes, it is possible but the
scope of the renovations necessary to fit it all would be pretty monstrous.
To switch from a sail drive to a shaft drive... is problematic. The prop really needs to be kept in generally the same place, so you will need to move the
engine forward quite a bit. Then drill a 1-1.5" hole in the bottom of the boat likely thru
parts of the
keel or keel sump, build out a new
engine mount... This is an enormous
project, likely to cost more than the boat is worth.
Cutting down the keel. Again technically possible, but you need to replace the
lost RM. The formula is RM=m*d where m is mass and d is distance from the center of buoyancy. So Not only do you have to add back the weight you remove, you also need to add more to make up for the shallower keel. How much total just depends on the amount removed and the
draft reduction.
But you have to keep the total mass of the boat below the designed max
displacement or you can induce other issues.