Cool stuff, way more advanced than I thought of. I don't have an account but might create one, on phone right now. But I drop my 2 cents here. I rather see a free version with a simple relationship between MRs. Basically;

  If linked_mr:
    print "warning, merging this will also merge:" + linked_mr

  ...

  Function merge()
    ...
    if linked_mr:
      merge(linked_mr)

Then building a more advanced version for EE.