from sino border and are within range of cheapo PLA rockets (Another one is the assam chicken neck)

Better still, equip those rockets with hypersonic(mach 5 to 6)glider warheads. Not to mention those rockets have longer range when launched from hi tibet altitude. Given Chinese mil budget, industrial scale and capacity ,a few 100s of them are quite affordably expendable.

A major task of PLA  Rocket Force is covering TW within its rocket range envelope. One can compare with the distance south of the himalayas

https://militarywatchmagazine.com/article/china-s-massive-new-rocket-artillery-system-could-devastate-taiwan

While failing to make headlines as larger and more strategic Chinese weapons systems have, the DF-41 ballistic missile being a prime example, the People’s Liberation Army’s (PLA) new PCL191 rocket artillery system is nevertheless a potentially game changing platform for the country’s military capabilities. Dubbed by state media outlet CCTV as “a self-propelled rocket launcher with precision strike capability,” the system is among the heaviest in the world with a range rivalled only by its North Korean counterpart the KN-25. The platform retains a 350km range, and each carries eight 370 mm rockets which can be fired in salvoes with high precision. The PCL191 can also be used as a launcher for two 750 mm ‘Fire Dragon 480’ tactical ballistic missiles with short 500 km ranges.