You are going to have to refinish that deck surface anyway, and this is a good time to epoxy-re-pot all the deck fittings if you have not already done so. Just use a vibration cutter and follow up with a heat gun to soften the epoxy. It's a big project, and I would advise using a Fein, rather than a cheap knockoff. Use quality blades and change them often.
Is the OEM Treadmaster cracked and starting to peel from the edges? After enough decades that's normal.
Great stuff, but it has a life limit.
Heck, you could do an LPU repaint, and then apply another Treadmaster non skid pattern.... and worry about it again in another 30 years! It's a durable and safe surface.
Good luck! You have a very fast classic (and classy) boat.