I believe that the current Fairbourne screen is legal because the driver can look over it and it therefroe does not require wipers.
Fairbourne have confirmed that they are beginning to look into developing a hood for the 5 speeder but I do not know if it will work with the existing Fairbourne screen, because the presence of a hood will prevent the driver being able look over it and therefore wipers will be required.
Blimey..! Can you imagine getting in & out with it up..? I'd stand a better chance of arm wrestling an octopus..!!