Love the idea !.....Any new addition of a Cafe is a great Idea. I think a Cafe based on a C-5 frame would be a little more nimble .
From what I know RE is working on a cafe racer right from the factory. Rumor has it that it might even have a higher displacement engine.....I would wait and watch. This bike: http://www.enfieldmotorcycles.com/forum/index.php?action=gallery;sa=view;id=2497is based off the same frame as the B5.