My experience with tuilik hoods has not been too good, and I would rather have a watertight seal.

You could use a divers hood to supplement.Reduce that cold shock.
I am now going down this road with my Outer Island ocean cockpit arrangement.Makes sense for winter paddling.I hope to drop the Pfd as it constrains my efforts to twist and reach forward inverted.all that neoprene should be enough to keep me floating if I muck my roll up.