Pumpkins in Oregon are magic.

If youre sitting in it low enough I think it would be fine. As long as the center of gravity is below the waterline.

Your giant brass danglers act as ballast

Put the giant pumpkin in the water.

Cut a hole in the top once it stops spinning.

Hop in.

As long as you keep your butt/ knees/ feet at the lowest point your weight will act as a ballast.