Well, actually Shekou would work - the flight is at 10:20 on AF.....I did it last year, and the HI arranged it for me....waste of money though, but easy.
I've now decided that GZ is out of the picture, but KA came to mind - of course, then I've got 10+ hours at HKG, but I can easily make the 20:30 flight at PEK.
Maybe the best course of action is just booking a low-fare ticket on the MF flight TSN-SZX (1000 a/i or so) - hope I can get there by 18:45 - and then go to Shekou in the AM, or even Huanggang is OK.
I really can't leave TSN any earlier than 5 PM - so it's either this one flight or rushing over to PEK.