Worth the effort?
Hans - By 'on the deck' I'm assuming you don't mean in the cockpit, but at a location where, if the bond failed, your "light duty" whatever would probably wind up in Neptunes' locker. I can't imagine that it would be worth the trouble, time & cost to do it vs the trouble it would take to fill a bolt/screw hole if you decide to remove the whatever, but if the surface is properly prepared ( all wax, silicones etc etc removed from the surface) and the adhesive properly applied & allowed to cure, something like 3M5200 or a comparable product would undoubtedly bond. For a while. Just how long the bond lasts given exposure to UV, salt water,heat & heaven-knows-what chemicals, is uncertain. I've seen a product advertised that claims to free anything bonded with 5200 : IF it works, then your idea is probably viable and the bonded item could be removed without damage to the underlying laminate/gelcoat. I can't see it being worthwhile, but if you're prepared to gamble, fill your boots & good luck.