I would first try coupling directly to the saildrive, I think. Anyway, it will at least give you a baseline to work from. As for belt drive, they all make SOME noise, some more than others. You might not even hear it in the cockpit. Cost depends on, well, cost. I think you are in Denmark, from your email domain? I don't know what sources you have in Europe but here in the U.S. one can order all sorts of pulleys, hubs, belts, etc from McMaster-Carr and other suppliers, and a belt reduction setup shouldn't cost more than about $300 or so. If you are good at scrounging/salvaging, you might do a lot better. Do remember that no power conversion can be 100% efficient. Possibly there might be some benefit from a different reduction ratio, and possibly losses in the reduction gear would be more than what you saved... or less. If you just couple it to the saildrive it should work. Maybe optimally, maybe not, but it should get you on the water and give you propulsion. So, that is how I would begin, if it were me.
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