At the moment, if there’s an regional, alphabetical Napster-link for an artist on MusicBrainz, it’s shown on the artist page. If you click on it, it redirects to the global link with the numeric, unique ID of the artist on Napster.
Example:
https://musicbrainz.org/artist/5b11f4ce-a62d-471e-81fc-a69a8278c7da
Link shown to Napster US:
https://us.napster.com/artist/nirvana
If I click on it, the page redirects to
https://web.napster.com/artist/art.69299?catalog=us
Since the artist IDs on Napster are not regional at all, I link to the unique artist ID on Napster when editing. Example:
https://musicbrainz.org/artist/8fc89a2c-d01a-41ae-a6fc-d7e7300d8ee5
https://web.napster.com/artist/art.60899
But in this case, the Napster link gets hidden, you need to click on View all relationships.
With respect, that seems absurd to me. I suggest reverting to Napster’s unique, globally used numeric IDs and not linking ‘Napster US’ in artist profiles, but… Napster!