Dynamically Group By / Merge Row

Hi All,

I have tried to create a model which implements some basic 'Column' level security.

Essentially the columns that require security are placed in a seperate table which has some RLS rules,

I then have a measure which calls values from the secure table using ISFIRSTNONBLANK and USERELATIONSHIP, if there are BLANK values (i.e. the user has no access) it returns the string '(CONFIDENTIAL)'.

This solution works well:

Here is the model:

Here is the measure:

ProductDescription =
IF (
    ISBLANK (
        CALCULATE (
            CALCULATE ( LASTNONBLANK ( FactProductConfidential[ProductDescription], "" ) ),
            USERELATIONSHIP ( FactProductConfidential[FKProduct], DimProduct[SKProduct] ),
            ALLSELECTED ( FactProductConfidential )
        )
    ),
    "(CONFIDENTIAL)",
    CALCULATE (
        CALCULATE ( LASTNONBLANK ( FactProductConfidential[ProductDescription], "" ) ),
        USERELATIONSHIP ( FactProductConfidential[FKProduct], DimProduct[SKProduct] ),
        ALLSELECTED ( FactProductConfidential )
    )
)

Here is the PBIX:
https://drive.google.com/file/d/1M0z40xBMysrEtfYAGCYzer1HTvgpybMY/view?usp=sharing 

My issue is I'd like to group/merge all the '(CONFIDENTIAL)' results together and I keep going in loops to solve this. 

I think a big problem is DimProduct[ProductNumber] (or SKProduct) need to be present on the report to give the row context to the [ProductDescription] measure. 

Anyone have any ideas?