Interesting concept for sure. But couldn't you just cut the cover, push the fibers to one side and snip the chain? I like the ease of storage on the bike especially.
I searched and searched for a solution for my hybrid which is the only one I ever leave locked up for any period of time and have been using the Abus Bordo Granit X 6500 (sounds like a weight loss supplement, I know), but it's as heavy as a kryptonite u-lock. I would have definitely considered your lock if it was available at the time.
the case can mount using the braze-ons.