I think the best bet for Taiwan would be for the US to provide them hundreds of minibus sized, 2 man crew mini submarines, each of which would carry 2 torpedoes optimized for surface warships or submarines, in sealed pods outside of the mini sub.
They would listen passively for ship sounds, and have a registry with known enemy vessel signatures. Their mission operational range would be between 96 and 120 hours, though once in position they would remain in place.
Their top would have sonar camouflage so they looked like normal sea bottom.