They are all original from 2007. I don’t know if they work or not, I’m not sure how to test them. But I can tell you from the back they are all a solid mass of rust and corrosion
you can't test them. You can't switch them off. If you get new ones they will rust too.
Google "red button breaker".
Blue Seas makes a "better " version (they will still rust) that has lugs and nuts instead of phillips screws. So you will have to remake the terminal ends on the wires. If you have to do that anyways then might as well get a good trip-able breaker.
looks like you have plenty of room to work with. my boat equipment salvage shop has tons of old panels i bet i could find one that with some modification would work. or go whole hog and have new wire make you one. mount it on the outside not inside as pic shows and you have much more leeway. yes use trip breakers
Pacer’s Klixon circuit breakers offer ignition protection in marine environments. They are rated 5-40 amps in the harshest marine conditions. Easy to install.