Random idea: With cross straight tensions getting higher, Taiwan looks to improve its defences further. Add to this a desire by the US to be more active in its defence but also not wanting to 'formally' station US Military forces in country. Result, something akin to a modern "Flying Tigers' is created with US supplied platforms, flown by American pilots but nominally part of the ROCAF's strength and wearing ROCAF markings. Possible way for the likes of F-15Es, F-35s and related to get into ROCAF markings.