@darius @d3cline

Without mocking all this up, I'm leaning towards 7a=5a as follows:

5a: Follows -- Add a second (optional) section to the set of accounts, following a "Filtered" subhead

7a. List members -- Add a second (optional) section to the set of accounts, following an "Filtered by other lists" subhead. If this list is toggled to be filtered (at top), then reword subhead to "Also filtered by ..."

Same accessible design works for both cases + degrades to current UX if not needed