(1) Stop looking for waterproof motorcycling gloves
(2) Start looking at snow skiing stuff, I have a set of Dents gloves, warm and toastie, and best still dry.
(3) Handle bar mitts, like the pommie oxford units are brillant too.
Yes 7 hrs with wet hands does suck, when you used to work 11 to 12 hrs a day in melbourne in winter as a motorcycle courier.