I think that with a little thought one could design a drop in hatch cover ( for the engine well front opening) with some one pretty large one-way valves that would allow water to drain from the cockpit into the well and out while keeping water out.

A nice looking teak or mahogany cover with horizontal slots cut in, and rubber strips over the slots fastened top and sides on the back would be a good flapper valve. Wouldn't be a perfect seal but the rubber would flex to let water drain out while keeping most water from coming in.

Top-hinged wooden flaps with light elastic to keep them closed could allow for larger openings with better sealing.

Ken.