Visa on arrival Haikou

I am an Australian travelling to China on 27th Oct. I have an APEC travel card that expires on 29th Oct. I have applied for a new APEC card but it has not been approved by China yet. My question is 1. Is it ok for my APEC card (which is the equivalent of a 2 month multi entry Visa) to expire while im in China; 2. If its not ok, can I get a VOA in Haikou. I'm travelling for business. Should I get a letter from my client in Hainan? Thanks