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Tim,
hate to say it but the through hull fittings are basically your only choice. Creating a system where you literally suck it out through the deck fitting sounds easy until it breaks at sea, or you have 3 feet of green water on deck for 3 days before it finally rips your improvised fitting off and sinks you and the boat in a pool of poo.
Since you have to do it anyway, do it right and have a direct overboard fitting put in with a y valve that makes it selectable to pump to the tank or overboard, and another valve that allows you to gravity drain your holding tank via the direct overboard through hull. It's just one hole and, two valves and some hose - but DO NOT stint on the quality of the hose it has to be sanity (impermeable) rated, and rigid so you can pump it/create a suction without collapse. Should not run more than 300 bucks or so and you can do most of it yourself.
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