Yes, and no.
The main reason linking L&C, SR, and SV to the Arrowverse makes sense is because of the fact that those realities feature characters played by actors who have appeared in the Arrowverse in some capacity and the fact that The Flash has established that the "alternate universe doppelganger" is a legitimate thing, making it possible to think of Superman Returns' Clark Kent, Lois and Clark's titular characters, and Smallville's Ella Lane, Curtis Knox, and Supergirl as being legitimate doppelgangers for the Arrowverse's Ray Palmer, Jeremiah Danvers, Queen Rhea, and Indigo/Brainiac 8.
The same principle applies to the Donnerverse Supergirl and the series Eli Stone, Ally McBeal, Grey's Anatomy, Reunion, Desperate Housewives, and Brothers and Sisters as well, actually, which is kind of funny.
Trying to link series (DC-related or otherwise) that don't share actors with the Arrowverse kind of breaks the concept/conceit.