"King From Qin" Qarakhanid Coins?

Islamic coins traditionally named two kinds of rulers on their coins: the direct sultan or ruler that issued the coin, and the Caliph which was recognized by that Sultan.

An Islamic Sultanate would never have acknowledged suzerainty under a non-Islamic ruler, like China, on their coins, as it would have been elevating the Emperor of China to the same status as the Caliph. The Emperor might have been physically closer, and more powerful, but he was a pagan infidel, not worthy to share the same piece of metal as the verses of the Quran.

If anything, it's the other way around: The Qarakhanids putting in an ambit claim to be rulers over China and the East.

Qarakhanid coins are a poorly researched arm of Islamic numismatics. While I concede it's entirely possible that some rare and hard-to-find coins might have an inscription that could be force-translated that way, I highly doubt that it happened "often", since that vast majority of Qarakhanid coins seem to have no such inscription.