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Commutation is another way I guess, but it could be done electronically using existing slip rings and a hall sensor. There's also the option of only doing half wave rectification at double the current, it should make no difference to the heat, but it will only have 0.3v drop across one Schottky at something like 40v at 1000rpm (0.75% lost). I played around with inductor capacitor combinations in parallel, and was able to get AC converted to DC without any active components, but it would not work once rpm changed.
A buck converter has only 3 components, so should be cheap, even at high current. It does not need fancy filtering, remember that the output from an alternator is very dirty
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