Could a Northern Fleet battleship avoid Royal Sovereign's maintenance problems?

Would Soviet battleships suffer Royal Sovereign-style maintenance failures in the Northern Fleet?

Not inevitably, but only because a northern battleship program would have to construct maintenance facilities that the historical Northern Fleet did not possess.

The Soviet Union maintained battleships in the Baltic and Black Sea, where its existing capital ships were based. The Northern Fleet lacked equivalent support because it had never needed to sustain a battleship force. A treaty program that sent new capital ships north would therefore require maintenance facilities to be developed alongside the ships. That investment could prevent a simple repeat of Royal Sovereign's service problems, but it adds another expensive dependency to the counterfactual fleet.