Jonny,
I really dig some of the youtube clips you've posted in the past. Regardless of what comes next, I wish you all the best on your quest.....
From what I've seen, Alembic has made several 30.75 basses with their Darling shape~ it's a lot like their BalK shape. I haven't bothered to A/B the two body shapes, but I think the Darling shape is a little more symmetrical due to less neck-dive. I think one of Alembic's European dealers have one on their site....