We contacted this agency http://www.fbt-chinavisa.com.hk/
to ask if it was possible for us to apply in Hong Kong for Chinese visa and got the following answer:
"We can provide 2 options:
1) Individual visa
Usually for belgium passport without HK id, you can apply for single/ double entry tourist L visa or business M visa, each entry 30 days.
Usually it will take you 4 working days.
4 days service (Monday –Friday):
It will be issued by HK visa office.
You could apply single or double entry tourist “L” visa or business “M” visa for staying 30 days.
Single is HKD450.00.
Double is HKD550.00.
Arrive before 1:30pm, Pick up around 12:00pm on 4th working day.
If you want express:
2 days service (Monday –Friday):
Single is HKD2350.00.
Double is HKD2450.00.
Arrive before 9:30am, Pick up 12:00pm next working day.
Arrive before 1:30pm, Pick up 4:00pm next working day.
Same day service (Monday –Friday):
Single is HKD2750.00.
Double is HKD2850.00.
Arrive before 9:30am, Pick up 6:00pm same day.
Please bring your passport original, 1 photo and arrival Hong Kong Sticker for application.
No need for flight ticker nor hotel voucher.
For business visa we also need business license of Chinese company and your invitation letter from Chinese company, with red company chok and contact person signature on it.
2) Group visa
If there are 2 person or more. You may apply group visa.
Provide flight ticket and hotel booking if possible.
You must enter and exit together.
And the visa is single entry valid for 30 days since the day issued.
You need to enter China within 15 days since visa issued.
Price is HKD500.00 for each person to apply on weekdays.
Arrive before 12:30pm. Pick up around 6:00pm.
Price is HKD650.00 for each person to apply on Sat.
Arrive before 9:00am, pick up around 1:30pm.
Please bring your passport original, 1 photo and arrival Hong Kong Sticker for application."
We have Belgian passports with stamp of Turkey and Iran.