I'm sorry, but I fail to see how sponsor-provided boats sailing across the Atlantic is going to gain the interest of the non-sailing public.

Even golfers take their clubs home with them.

It still seems like a very expensive race you're dreaming about.

I think you'd get more people to watch 10 Tornado teams racing across the Atlantic. Slightly less extreme, would be 10 Reynolds 21-style boats. Call them maximum beach-cats or minimum cruisers if you will. An added flair would be if the teams each built their own boats. You'd have stitch-and-glue plywood designs going up against strip-planked cedar or foam-sandwich boats. Kinda like a poor-mans Paris-Dakaar race across open ocean.