I take it the rental long arm doesn't have robotic patterns available? Maybe talk to the longarm owner, show her (him?) the pattern you're hoping to quilt and ask if they can advise you the best way to quilt something similar.
Another thought is to look at the longarmer's current stash of pantos (if she/he has any) to see if there's anything you like, or you can go online and look at patterns. Maybe you'll find one you like and can purchase to use.