Can a patent inventor change the procedure without going through the agency of the patent office?

Yes, you can. Need to submit a change request to the patent administration department, and the corresponding certification materials, which can be changed after approval; Acting by the patent office saves time and effort and is more professional.

Based on:

6.7.2. 1 Guide to Patent Examination Part I Chapter I Name Change of the Applicant (or the Patent Holder)

(1) If an individual requests to change his/her name, he/she shall submit a certificate issued by the household registration management department.

Guide to Patent Examination Part I Chapter I Changes of Inventors in 6.7.2.3

(1) For the change request due to the inventor's name change, please refer to item (1) in section 6.7.2. 1 of this chapter.

Rules.

(2) Where the inventor requests a change due to omission or wrong filling, it shall submit the certificate signed or sealed by all applicants (or patentees) and all inventors before the change.

(3) Where a change request is made due to the dispute over the qualification of the inventor, the provisions in Item (1) of 6.7.2.2 Section of this chapter shall be referred to.

(4) Where the Chinese translation is requested to be revised, the inventor's statement shall be submitted.