For a while now there have been electronic musical keyboard controllers (the most recent one is Osmose) that feature pressure sensing and side-to-side sensing in addition to velocity sensing.
There are loads of books that discuss techniques for improving performance on piano. And there are corresponding technique books for organ and harpsichord, which are non-velocity sensing. You could use those technique books with something like the Osmose, but none of them would exercise the pressure sensing feature of the controller.
My question is, what techniques would you need to practise on one of the newer controller keyboards? Would it be a keyboard book? Could you learn by performing woodwind exercises?
The Ondes Martenot was considered a proper musical instrument in the early 20th Century - you could study it in conservatoire. I expect there'd be some crossover between Ondes technique books and Osmose, but what else would you need to study?