Turns out some of my calculations with regard to Visa extensions were incorrect.
It’s now No Longer Possible to get a 1-month extension without paying $100+. You can get a 7day extension for $50.
This has come as a surprise, and changed my plans –
I took a visit to the Chinese embassy this morning, to check things out there. They told me I still had a valid Visa for travel to China.
Having spoken to the agencies, I’m not totally optimistic that I’ll be able to find a job there AND sort things out within 30 days.