I rode a few Brooks saddles for a while, and while I think they were somewhat helpful in that respect on longer/more strenuous rides I can't see it making the difference on a commute. Really if you sweat that much where butt meets saddle you should reconsider what you're wearing in my opinion.

Tioga makes a few "Spyder" saddles with an open design. Certainly a long way from a Brooks B17.