Booking a new ticket with a different airline to enjoy the transit visa

Hello,

My flight from Auckland to Hong Kong will lead me via Shanghai airport. The original flight with China Eastern is timed well and the timing will not allow me to leave the airport.

I want to book a new ticket, only from Shanghai to Hong Kong (as a new connection flight), with a different airline for the day after arriving from Auckland, thus maybe resulting in a stay of 20-30 hours in Shanghai. Would that still make me eligible for a free transit ? I am German, and thus on the list of eligible countries.