Originally Posted by
YuropFlyer
Thanks for all the information guys ^
He will not try this then, but rather get a correct visa into his EU passport.
Which leaves me (or better him

) with the question if the consulate handing out the Visas will actually double-check with Chinese central register (is there any?) if he's Chinese national?
He told me he won't have problems in getting a new Chinese passport in China itself. (Asked him about this, as mntblue suggested to take care about it.) Probably he knows someone there

There is no need for a central registry.
In most passports there's information about birth place. If the passport says that the birth place is China, and there is no Chinese visa on the passport, one will be asked to show his/her old Chinese passport. This is how they enforce it in the Chinese consulates in US.