Would T-class submarines still be in the Pacific in 1942?

Would T-class submarines still be in the Pacific if war began in 1942?

Yes. Without the historical Mediterranean losses, more boats would probably remain in the Pacific.

The historical transfer was gradual as Mediterranean losses created demand for replacements. It was not a general withdrawal at the outbreak of war in 1939. The T class had been designed for a different operating requirement, but that did not prevent the Navy transferring boats when the Mediterranean needed them.