In the 60's Duncan trick list they had the twin-spin thrown behind the back and caught on the front: Twin Orbits.
Oh, very nice, is somewhere the whole trick list? It could definitely be an inspiration!
You can see the list of tricks on the page on the right:
Circle the Globe is boomerang around the back (by the way, it seems they mistakenly swapped the photo with Twin Orbits).
Crazy Maze is hand passing under the legs and behind the back.
Double Trouble is twin boomerang. Double Daze is twin under the leg boomerang. Gemini Jump is twin sky rocket.