Don't worry. As I said earlier,
China doesn't want Biden in power. They want Trump.
You spoke about missiles being sold to Taiwan. I am sure you'd realise that these missiles are to be delivered to Taiwan by sea or air.
If you have been paying attention to the Taiwan Straits right now, mainland China is kicking Taiwanese arse when it comes to controlling airspace. Planes from Taiwan trying to supply offshore islands are forced to turn back because of PLA planes.
What makes you think China can't stop air and maritime traffic by imposing no fly zones and a maritime blockade?
So the only thing an arms sale would achieve is to give China excuses to take Taiwan.
If you are really concerned about Taiwan, sending boots to the ground is still stupid but makes slightly more sense. The Obamaesque solution, which I think is the best, would be to get Taiwan to pay lip service to the One China Principle, tell them to stop stirring shit at Hong Kong, and give the Communists less reason to send boots over.