Spend the money on a dust deputy, a long shop vac hose (mie is 13ft, I think), and a remote control outlet. The long hose allows your vacuum to be out of the boat, giving you space to work. The remote outlet lets you control the vacuum that is now out of your reach, and the dust deputy means you'll almost never clog another shop vacuum filter.
Grinder with a flap disc is the way. Hold it in one hand, vacuum hose in the other, or get creative with your legs like Scott said. Build an air tight tent over the boat with painters plastic and painters tape. Duct in fresh air with a fan on low through the keyhole.
Grinder with a flap disc is the way. Hold it in one hand, vacuum hose in the other, or get creative with your legs like Scott said. Build an air tight tent over the boat with painters plastic and painters tape. Duct in fresh air with a fan on low through the keyhole.