Looks like a job for a Dremel tool to me. It would take some work, but you probably could use the Dremel to grind out the holes to match a round dowel. If you could turn a step on the dowel or post the hull could more securely glue to that. Or, fashion a cylindrical collar to fit over the dowel to create a step.
I used to use brass stanchions made from lamp finials as mounts, but lately I have taken to using clear acrylic (Plexiglas) rods as mounts. If you know someone with a lathe you could have him turn an adapter from wood or something, that would have a step to better glue the hull to, and a hole drilled for maybe a half-inch acrylic rod. You'd need two of these, one for each hole in hull.
Another possibility is a cradle, about half the width of the hull, just longer than the distance between the holes. Make it out of 3/4 inch wood- nice hardwood. You'd have to sand or carve a slight curve in this to match the curve of the bottom of the hull. Then make a base larger than the ship out of either the same, or a contrasting wood. The "cradle", a simple stick of wood, would act as an interface between ship bottom and base. The hull would be epoxied the cradle piece, which would in turn be glued to the base.