Fuel tank valves
If you are going to be playing with the actual fuel valves , you might consider remoting the shut offs.
This is a Requirement on any USCG licensed boat above 6 pack , and makes a lot of sense for a couple of bucks.
Outboard shift cables are cheap and robust , might be nice to have a small fire STAY a small fire.
Remember a GRP (fiberglass boat) hull fire can not be put out with less than a military airport crash unit.