Pretty much everything we "know" about the post-Acts lives of the disciples comes from later Church tradition (sometimes much later, as in the story of St. James in Spain, which doesn't seem to appear until 700 at the very earliest), which is often unreliable and has more to do with later needs for prestige (Bishop of X is feuding with Bishop of Y over relative rankings? it turns out that the Bishopric of X was founded by an apostle, while the Bishopric of Y was founded by a generic minor cleric) or pilgrimage. It's certainly possible that if a Christian community starts up in China during the later Han, that they might at some point retroactively claim descent from an apostle, in much the same way various churches did elsewhere OTL.
Getting an actual disciple all the way to China is more difficult; they were Galilean peasants, after all, and early missionary work (both by the 12 disciples and by other early missionaries like Paul, Apollos or Barnabas) seems to have focused on areas with significant Jewish or Greek communities (and the latter seems to have been controversial with quite a few members of the early Church, as seen in Paul's epistles, especially Galatians). Unlike India (which probably didn't actually see a visit from St. Thomas, but did develop a small Christian community fairly early), China doesn't have significant numbers of either of those populations, and while there was some Roman contact with China, it was far more difficult and less extensive than Roman contact with India.