This lawyer is th worest I have ever heard and his/her comments is ridicular.
If this lawyer insist you need to get the visa and you can not change the lawyer, you had better go to China to get the visa. Any U.S. consulates in China will be OK, but you had better decide which one you want to go for the visa now and indicate in the form. You can call the U.S. Consulates in China to make an appointment. Here is a website for your information: http://www.iflychina.net/visa/articles
I really do not know whether Chinese citizen can stay in Hongkong for a few days.
If this lawyer insist you need to get the visa and you can not change the lawyer, you had better go to China to get the visa. Any U.S. consulates in China will be OK, but you had better decide which one you want to go for the visa now and indicate in the form. You can call the U.S. Consulates in China to make an appointment. Here is a website for your information: http://www.iflychina.net/visa/articles
I really do not know whether Chinese citizen can stay in Hongkong for a few days.