Thanks for your feedback! My visa will be for 90 days max. I understand I will not be able to get a full license with such a visa. I am planning to get a temporary C1D or C1E license at Beijing International Airport (I do have a similar driving license back home). Some sources (but not all) tell me they will only provide a temporary license for a car, not for a motorcycle. In that case I will settle for that and hope, if stopped, to convince the police of my good intentions with that driving license and a translation of my original one.