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I'd personally be inclined to install decent macerating electric heads and ditch the Vacuflush. They're incredibly simple mechanically and work very well, so they're nice to live with and easy to keep working. Feed them all to a holding tank (or 2, depending on boat layout) and make sure the tank is equipped for both pumpout and overboard discharge.
That should give a much nicer, more convenient experience than any of the port-a-potty types.
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