Re: I'll start here ......
Remember that a lot of fishing boats go out to sea year round with a single diesel. Add a kicker bracket for the OB for your dink if u must. 7/8 knots is plenty fast for fishing and if you fish when the waves kick up like I do then your not going much faster than that anyway. Might as well get a sea kindly hull. Trawlers have mucho space and are real boats.
One other thing to remember it is much safer to be in the briny blue than near shore.
Near shore has inlets and rocks and shoals.