Making a new visa in Hong Kong after an extension at the PSB

Hello,

I am planning to go to Hong Kong to renew one to China.

I am a French passport holder currently living in Shanghai on an extended (one month extension) double entry with 30 days per entry one (I've therefore stayed there for 2-3 months in total).
I was wondering if in this situation I would be able to get another double entry 30 days per entry one in Hong Kong? (or at least one entry)
If yes, would it be better to go through an agency or try directly myself?
And if no, would I have better luck in my home country (France) or am I stuck out of China for a while after my extension expires?

Thank you in advance