

Travel from UK to Thailand via WUH&SZX total of 22.33h under single (through) ticket
I take that I am eligible for 24 TWOV as total time between scheduled arrival to Wuhan (16:20) and scheduled departure in Shenzen (14:40) is 22h 20min. I intend to apply for visa-free entry permit as long stayover in Wuhan (16h) which may or may not be granted but with accommodation booked that would hopefully minimise chance for refusal. I take that if this is granted it will work for Wuhan municipal area (so include airport & city) or could that vary?
As the margin is relatively narrow I wonder what would happen in event of flight delay or cancellation. In point 5 of procedure note for 72 TWOV there was advice to apply for visa from Municipal Public Security Bureau (PSB) which I take are usually located in the cities. Is that the only way or perhaps that can be
immigration authorities at the airport? I am considering a very unfortunate scenario of visa-free entry permit refusal where according to notes I won't be able to leave restricted transition area to sort out visa.
Lastly, as per notes obtaining visa-free entry permit give access to check-in luggage. Out of curiosity if permit is not granted is the luggage going to be simply transferred to connecting flight or would that depend on prior instructions given to airline and/or airline policy so best to check with them? Sorry, in case this is obvious - it's first time I am transiting through country with visa requirement on connecting flights with check-in luggage.
I would normally get visa in advance but getting visa for one day for approx £320 (2 people) is a little bit step so keen to explore alternative to that.
Thank you for all your help.