It is beyond doubt that Taiwan relies on a Taiwan Lobby of old American rightwingers and younger paid lobbyists to hopefully pressure the US Government. Taiwanese Cold Warriors hope that the US will return to near conflict with China. China is, however, too important economically to the US, now days. Since the 1970s the US One China policy steadily shifted to the PRC not Taiwan (including the US's weapons' policy).
Tellingly, even in 2001, Taiwan was unwilling to pay market prices to the US or a third country for submarines. Instead Taiwan decided to rely on the US Foreign Military Sales (FMS) system. FMS for submarines - large weapons systems the US did not actually produce - was a non-starter from the beginning.
Also Taiwan wanted medium to large conventional submarines. It would not settle for submarines of less than 1,000 tonnes - more than adequate for Taiwan Straits defense against China...
As well as not paying for the submarines Taiwan had and has ludicrous ideas on how to acquire them. These ideas all involve the US taking on the financial, political and technical burdens upfront and presumably for ongoing upgrades. For example potential scenarios like:
- the US buys old submarines from Australia and custom upgrades them for Taiwan.
- the US organises for Japan to build the Soryu submarines for Taiwan and then Lockheed Martin
integrates the US highly secret combat system into the submarines
- that the US pressures Australia to participate with Taiwan in a joint purchase of Shortfins from
- that the US assists Taiwan in building a submarine production line (in effective competition against Japanese, South Korean and European submarine makers)
1. As I've said Taiwan needs to be prepared to pay international prices by contract for submarines. Israel, equally unpopular internationally has managed to organise Germany as a long term provider of TKMS Dolphin submarines. Israel is now reputedly paying full prices - including for maintenance. If Taiwan were serious Taiwan would not be waiting for the US to magically give Taiwan submarines.
2. Countries also need to be confident any submarine secrets passed to Taiwan do not find their way to China in the medium to long term (in any political settlement with China).
3. There is no way around Taiwan building its own - the smaller (for defense) the easier to do.