sharing/collaboration private github fork between licensed developers?

Is there a way to automate access to our forks to make sure only folks with valid UE4 licenses can access the fork?

I have an OUYA version of the UE4 4.5 Branch that I want to share with UE4 users.

What’s the best way to go about this?

Is it possible make an OUYA fork within the Epic Games · GitHub organization?