Fwiw...
There are synthetic flooring materials suitable for use on boats. On a flight a couple of years ago I happened to sit next to the president of a company that supplies it some of the high end powerboat builders, including Hatteras, Viking, Bertram and SeaRay. Unfortunately I lost his card...but I bet if you call any of those builders and ask 'em what they use, they'd tell you. I doubt if it's inexpensive, though.