What are your TPAC patterns? Are you flying paid F/J? MU will start a n/s from ORD next year, which might be of interest, but CZ doesn't have any such service. Otherwise, you're going to have to fly DL with extra stops (eg: ORD-DTW-PVG, or maybe ORD-SEA on AS then SEA-PVG on DL), which seems counter to your desire to optimize flight times.

MU and CZ seem to have something of a mixed reputation on this board... their newer hard product is pretty good but the soft product seems to be hit or miss.

Another option would be to keep OW for TPAC, then switch to ST within China. If you're flying paid F anyway, the status perks are going to be relatively minimal vs what you get as a premium passenger. You could then credit those miles to the ST program of your choosing. (I basically do the same thing going TATL... generally credit to DL for the long haul, and AA for intra-EU on OW carriers.)