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From wanting Garolite G-10 to exterior plywood is quite a transition in quality...
Anyhow, about G-10 - I just cut some backing plates out of it. It's a nightmare to work, it's basically like cutting solid glass. I wouldn't want to do big projects with it unless there was no other way. I was going to replace some weathered stand-offs for my hatch hinges & chocks with it, but after cutting the backing plates I've decided to just epoxy-coat wood instead. Much easier to deal with.
As for exterior plywood, I don't see how you'll get a decent finish with it, and it's not as structurally sound as marine plywood (but maybe that's balogna - I'm not an expert). You might be harming the boat, since you'll probably need to use the same thickness as the marine plywood you're replacing. It will definitely delaminate easier than marine plywood, the glue job doesn't compare.
I'd try to find a source for marine plywood if I were you.
I'd also just grab the multi-tool and chop things out wherever there isn't liner, and then see if you can remove the stuff that's between the liners. Maybe you'll get lucky. Wouldn't cut the liner as a first action, but only as a last resort. It looks like you have pretty good access to the bulkhead in your pictures.