Are you sure they're separate artists? Looking at the artist history, this artist tag originally belonged to an "hd 1735" and was renamed because of their Pixiv name (forum #219009). If they're truly different artists then another artist hijacked this tag and it should be reversed and separated properly, or they need to be checked again more thoroughly.
For example: post #6245821 comes from solcha's Twitter but is reposted to MEROPI's Pixiv as post #118435092 (and originally on the Twitter as well).
