Why not merely create a mount to fit a 5KW or so 48V motor directly onto your saildrive? The saildrive has usually about 2:1 reduction in its gearbox and room to swing a reasonable prop (old Outbords are restricted in that area).
I am in Australia and going a similar direction in my 25' quarter tonner, of using a 5KW 48V BLDC motor and driver onto a ZF shaft drive gearbox. I'll need to build a jointing/mount for motor and shaft to shaft connection that will also be a motor/gearbox mount too. The gearbox already has the thrust bearings etc and option to disengage gearbox to freewheel prop if not folding or use slightly different ratios of forward/reverse gears. Also two clutches so only need one if one gets a bit slippy as controller has revering.
BLDC Motor, controller, throttle, meters not too expensive (I imported a spare motor to sell-on - motor is powder coated alloy body, air cooled and stainless 7/8" shaft weighing 11kg). Batteries and chargers are more expensive part.
If interested in Asian motor sources, I may be able to help.
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