I find it very hard to imagine what an Ariel motorbike would look like, but I have no doubt it would be revolutionary.
I really like the idea of a lightweight, electric-powered performance bike, with a completely naked frame and really futuristic design. But I struggle to see how that could be so usable, and that's one of the things that Ariel wants from its bike.
So here's an idea. Ariel once produced a monstrosity of a thing called the Ariel 3 - a three-wheeled scooter that tilted to aid handling round corners. In the 70s that didn't work, and it was a poorly executed thing. So how about a performance three-wheeler with all those assets that Ariel wants? Usable, lightweight, handling and performance.
Three-wheelers at the moment tend to be heavy things that lack the finesse of a bike, so there's room for Ariel to re-write the design rules. How about it?