Can I find accommodation up on Fangjinshan in order to photograph sunrise?

Yes, there is some places where you can stay at night, but the condition is bad. If you are not afraid about that, that will be fine. The Wanbaoyan Reastaurant provide the accommodation without shower and a wide bed for a number of people.
As for the Jinyuan, do you mean the Jinyuan in Tongren, I do not think there is such as place in Tongren? Could you tell me information about Jinyuan that you want to? Is it a attractive spots, or place name?