Mark,
How did you get the driver's side back seat back to unlatch in the first place? I can't even get my hand back there. I would like to do the same as you did.
There’s a 13mm bolt that holds the seatback to the lower frame. Remove that and the seatback will pivot where you can get your hand back there. If you don’t have the strap, pull up on the tab that I attached the cable to.