I am pakistani national. the procedure from pakistan is comlicated becuase there is no embassy.

Dear, actually you can still apply from Pakistan.

You may submit your application in person to Chinese visa application service center, and your application will be forwarded to the Immigration Department of HKSAR Government for processing. You may also submit your application directly to the Immigration Department of HKSAR Government by mailing your materials.

Processing time: If your application is forwarded to HK Immigration Department for processing, it would take one month or even longer to process visa application.