you could cut your A/C inlet hose after the sea water strainer, and put a plastic T connection in.
the displacement of the boat will always push water upto a point, and it would be rare that you would use the live well, and the A/C at the same time, since the A/C is used when your not fishing.....
that is the only raw water except for the engines, which I would not recommend.
Your could do the same on a Generator if you had one.
If you have a vacuflush, that it dose not take raw water.
For the short run you could always throm a rubber tube over the rail.
makeing more holes in a boats not a good idea...
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