I did basically the same thing, but I just took the existing fuse, cut it in half and soldered a wire on each leg with shrink tubing over soldered leg so it can't short out against the other leg. Connected one leg to a lighted rocker switch (with an in-line fuse of same amperage) and the other leg to the other side of the switch. Plug in both legs of the split fuse into the fuse box and you're off and running.
Very simple and just the cost of the switch. Mounted it on the side of the console next to my leg. When lighted, the fuse is in the circuit. When I flip the rocker switch the light goes out and now the circuit is broken.
Sure beats pulling that fuse from the panel that you have to get down on your knees and twist your body in a very awkward position.
Your method sounds great...but a light indicating either on or off sure makes it more simple to use and without any guess work as to which way the switch as to be.
Ron
On edit, I corrected a couple of spelling errors...