forced retreat

[Kodor]

Is there a way to force a specific unit to retreat to another planet after a ground defeat even though orbit is secured by friendly forces?

 

For example,

 

I have already taken control of orbit and have friendly ships occupying the planet's space. I I have a non-victory relavent unit in a ground battle and I lose the ground battle(or retreat). I need this unit to be forced to the nearest friendly system rather than simply into orbit.

 

Kind of like when you sneak units past an enemy fleet, attack the planet and then retreat. Your units are forced to a friendly planet.