So I have a HKSAR and US passport. I am currently a US citizen reside in the US. I plan to visit china in a few months, if I enter china with the HKSAR passport then i don't need to apply for a visa. So if I want to use the HKSAR passport to enter china, how do I return back to the US?

Can I leave US with my US passport, enter china with my HKSAR passport, leave china with my HKSAR passport, and return to US with my US passport? Or I can't do that because china would need to know where i am coming from and US would need to know where I am returning from?

What about leaving US with my HKSAR passport, enter china with my HKSAR passport, leave china with my HKSAR passport, and entering back to US with my HKSAR passport? But then would I be able to enter US with my HKSAR passport? I am a US citizen afterall, how would this process work?

I guess I am just trying to get away with paying to apply for a VISA to china... is there anyway I can do this to make it work? if not, then I guess i will just have to apply for a china visa...