as long as you have the original copy of 戶口, the notary will d

but better if you also have another ID (shengfengzhen). Once these people know that the purpose is for immigration purpose, they will be glad to do these (for their income's sake, at least), as long as you have some ID. I got these docs without a valid 戶口, and without a valid ID (expired) (but I retained all the original expired ones), and with a 介紹信 from my institute.