Tricky RLS problem, probably to solve with DAX?

Gents,

I have a tricky problem of RLS.

Let say that i have this kind of FACT_Sales table

I need to put in place RLS for many users.

I usually put a security table column with usernames and the BUKRS that they have the right to see.

This time I need on top to say that the users need to see things based on the RecC column too. Of course when I use a model like below and that I say one user has the right to see BUKRS A  OR RecC A (interco), it won't show the line interco B A 25 (because of the first RLS) 😞

I tend to assume that the Security tables need to be disconnected and to use some DAX to pass the conditions?

Maybe with some RLS like in this video of Reza? https://www.youtube.com/watch?v=LyeAhV2665s

Would someone be Fit enough to tackle this challenge with me or have tips to suggest? (I might have not search google enough)

Of course a really Dirty solution would be to copy the Fact_Sales and separate everything, but I'm sure it could be done elegantly.

My real fact table has millions of lines, the security tables with users will have 1000s of lines and BUKRS a,nd RecC have 100s of values. So anything really manual with 1000s of roles doesn't interest me 🙂