Can I suggest for coupling motors to the shafts that you put a hex coupler on both the jet unit shafts and the motors and use a piece of flex in between, .150 or .187. That will sort the problem with vibration and a strong enough coupling system. You can get the couplers from OSE here.
BTW, I wouldn't be shy about fitting a cooling system, if you can tap into the jet units then you will have plenty of cooling water, you can even take water from the bottom of the intake and feed it back in further up. Drilling and fitting a couple of outlets in the transom would be fine and hardly noticeable.
NZMPBA 2013, 2016 Open Electric Champion. NZMPBA 2016 P Offshore Champion.
2016 SUHA Q Sport Hydro Hi Points Champion.
BOPMPBC Open Mono, Open Electric Champion.
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