How ten Dutch minelayers could delay Japan's advance

Would ten Dutch minelaying submarines, built at roughly one per year before 1940, have helped the Allies?

Yes; surviving boats could have delayed Japanese landings, damaged transports, and channeled traffic toward torpedo ambushes.

Several surviving boats could have planted offensive fields around approach routes in the East Indies without exposing surface minelayers to air attack. Even when mines caused no immediate sinking, their suspected presence would force minesweeping and delay amphibious schedules. Submarines could also mine one route and wait with torpedoes along the diversion, combining two forms of sea denial. That combination lets a small force impose operational friction out of proportion to its hull count.