Or you just do them both at the same time.
But no, it wouldn't be hard to do. What makes you think that?
It seems like a cool idea, although what would happen if Uke were to collide with that robot-Tori who you'd set the moves for? The Tori would just end up losing balance.
Granted, you could just try not to collide with the Tori, but usually parkour replays look best when the two characters are interacting, instead of just avoiding each other.
A dueler is only a good as his finest lift.