Yep, I see the disclaimer in the FSM now:
"Never disassemble front passenger seat cushion assembly. (USA/Canada model only)
Always replace as an assembly. For front passenger seat service parts, refer to the service part catalogue."
In that case, I'd start scouring car-part.com for a matching passenger seat, and just swap them.
Hard to say without laying hands on it, but I'd guess if you can disconnect the harness underneath and apply 12v and ground to the correct pair of terminals, you could 'jumper' the fore/aft motor and move the seat temporarily to remove it.