Overriding filter context and duplicate measure value

Hi everyone, the title probably does not accurately describe the problem but I hope the following example can. I have a measure [M_test sum] that sums the values based on the Attribute column using an inactive relationship (may/may not be relevant here). Attribute 2 always returns blank because the fact table only has attributes 1, 3, 4, 5. I would like this measure use Attribute 1 as the filter to sum Attibute 2, essentially replicating the sum of Attribute 1 (see Proposed below). The reason why this is needed is because the [Sum of Value] column will have different values for Attribute 1 and 2 which is sourced from a different table. [Sum of Value] and [M_test sum] will be compared against each other.

Current:

Proposed:

EDIT: The found a costly workaround which is to create a calculated column in the fact table that converts all Attribute 1 to 2 and create a measure (and a new inactive relationship) that sums this new column. Finally, sum the 2 measures to get desired results. Still prefer a solution that doesn't introduce calculated columns in the fact table.