I've seen a few pocket watches with independent jumping sweep seconds + chronograph...
and I know some ebauches sold to German companies so I presume that's where the inspiration comes from. I think the best way to do this in a wristwatch would be to put the fourth wheel in the center and couple them vertically, or with an oscillating pinio...
Found some more info on the german watches forum FB.
Movement Diameter 32mm, height 6.2mm, 22 jewels two ball bearings (ceramic), power reserve of 48h (+/- 10%), 18,000 b/h, classic lever escapement with polished lever and escape wheel, Glucydur screw balance with Nivarox-1-Brequet hairspring, swan neck fin...
Here's a great writeup of Friday's unveiling event on watchuseek, credit Mike Stuffler:
www.watchuseek.com ?post_id=58307669#post-58307669