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Here is what I would do. Forget about making the non skid deck area look original and new. Almost impossible with the condition of your deck. Cut out the broken glass, dig out the mushroomed foam, and patch the area with 3 oz. mat and grind smooth, Then cover the entire nonskid area with 1 1/2 oz. mat, sand and paint with hull. sprinkle non skid over the wet paint, and then roll on a second coat of paint over the non-skid area. No one will notice you lost the original non skid, becuase the rest of your job will be eye popping. That's what I did, check my personal page.
Here are some pics of the deck glassing:

http://s27.photobucket.com/albums/c19.../?start=60