After looking in all the available C seats, choices are down to PVG-BKK on TG, then from BKK to either FRA-LHR on LH or BKK-CPH-LHR on SAS. No other routing choices on *A that I could find. I want a midnight flight.
If you go from PVG up to PEK, then there are midnight/0100-ish flights from there. TK via IST or CA to FRA.
From PVG there is a midnight flight on CA to MXP and connect through from there as well. Whilst it's not midnight, an early evening flight SHA-HKG will connect with NZ's HKG-LHR.