Best wishes on your upcoming purchase! As you can tell from this forum, those of us who have taken the plunge are extremely happy we did. The Zendrum is a phenomenal instrument and working with David and Gina is a treat. You won't be disappointed.
BTW, how would this keyboard be applied to the ZD? I checked out the site, but I'm not following the idea. It looks to be an independent computer keyboard which allows each key to accept an image. The ZD doesn't accept a keyboard input AFAIK and I'm not sure how I would use it even if it did.