RLS for star schema model

Hello lovely people

I need to create a RLS at the [_MAL] table level to restrict the access at a regional level.

I cannot use the standard RLS approach to create a filter in the [_MAL] like [REGION] = "AAA"

And I cannot use the cross filter check approach since I have a star schema with multiple bi directional relationships.

I would like to avoid changing the model. How would you create a RLS for this schema?

Thanks a lot

Quentin