Filter Area Boundary Lines by Area Scheme

Is there a way to filter Area Boundary Lines by their Area Scheme? I can do this for the Areas, but I can’t find at way to this for the Lines. I need to be able to select all scheme-specific Area Boundary Lines in the entire project, not just in active view.

I’ve found a way using area’s themselves. Get the scheme, then filter to the desired scheme, then get the boundaries for each area, and lastly flatten and get unique items from that list.

EDIT: Added screenshot for clarity

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