Invisable Retainer with Window?

Invisable Retainer with Window?

I have a Doctors office that would like an Invisable Retainer with a hole on the lingual of the UL6 to allow the tooth to "Drift In" I was thinking I found a solution to notate this in the Appliance Library with the newly added " Motion Essix" but its not exactly what im looking for. Does anyone have a different name I can search under? Or any ideas how I can make a Template for this doctor weh they can denote windows on an Invisible retainer also where they cam move the hole/ window to any tooth and place on Buccal/ Facial, lingual and/or Occlusion/ whole tooth?

Kinda like MTM? Minor Tooth Movement system, where you can place a combination of dimples and windows in the essix to aid in the movement of the teeth?
Thank you for any input,
Cade