Japan Navy has its own Mitsubishi and Kawasaki maritime engines for its home made Navy vessels. Taiwan has nothing but poor at heavy industry and poor international relationship there. Only can get commerical maritime engines to power up Coast guard grade vessels , nothing much can do.
Maritime engine is not able to produce in Taiwan but only can get the commercial engine from Roll Royce- MTU via Singapore for coast guard vessel usage. Taiwan does not have modern navy combat technology even the copy cat submarine is year 1970 retirement blue print from Netherlands submarine as the copy samples.