Transit Guangzhou and use the 144 hours in Shanghai

Hi we were wanting to travel-PHUKET-GUANGZHOU (SHORT TRANSIT)-SH 3 DAYS-GUANGZHOU (SHORT TRANSIT) CHRISTCHURCH.
It appears that this itinerary will breach the rules of the 72 hour and 144 hour visa's in SH.
So to get around that problem could we instead do PHUKET-SH-3 DAYS--SEOUL (HALF A DAY TRANSIT) SEOUL-GUANGZHOU-CHRISTCHURCH?
Thank you for your help!!