Feature to create a private topic where multiple users can be invited but in different instances

Feature to create a private topic where multiple users can be invited but in different instances e.g

1 private topic has

Player A, B, C, D, E, F

But 'instances' of the same private topic set:

Topic XYZ (1) - only Player A and B invited

Topic XYZ (2) - only Player C and D invited

Topic XYZ (3) - only Player E and F  invited

Without needing to make copies of the same private topic, or having many copies of the same private topic in the CMS