Soak the wood in water for a day or so then go after it with a wire brush on an angle grinder.
Granite slab is perfect for pulling a vac on but you probably want to protect the surface - epoxy sticks real well to it - use poly sheeting as the top side of the vac bag and duct tape to seal it down to the slab if you are doing it with vac instead of weights. Put about 1/8-1/16 thick, ~1/2" wide strip of something (duct tape works) under the edges of the hatch when you do it so you induce a reverse dish - it also keeps resin from running out the old screw holes. Get a cheap vac pump (Harbor Freight or EBay?) - I like rotary vane pumps but piston pumps are ok too - do not use a shop vac; while it will kinda work, you run the risk of igniting the fumes and that is a bad day.
The bottom sheet of glass was never properly attached on any 23 SC tank hatch I have seen - the core should have had the edges beveled and the bottom glass should have been bonded to the underside of the hatch around the edges instead of just laying on the wood and barely touching the hatch edge.
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