What a novel concept. Somebody should patent that idea.
Seems to me they could come up with a steam and sail vessel. If the economics make sense for one sail, it would make sense for more than one.
Not to gloat, but I was a Merchant Marine Officer. I rose to 2nd Mate of Steam and Moter Vessels, Oceans. (That means the navigator).
Not that this gives me any expertise in sailing ships. My Dad actually did two years before the mast at the Pennsylvania Nautical School in the early 30's. They used a sailing ship and received a Third Mates license in 2 years.