Some still use UPS.
However, EMS is generally accepted in China.
I heard that I can send an email to official website and ask them to change to a domestic courier, but I haven't tried it.
As for tax collection, I don't think more than 90% will. But no matter who you ask, there is no guarantee that you will not be taxed. If you are taxed, you really win the lottery.
But conversion is possible. . . But this is all an accident.