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rhowe
Airhead
Extending that way is not going to attract any attention or change the Zs of the circuit by much if anything. It would be the same repairing that small section of wire if it was damaged.
The reason for the regs requiring certification for a new circuit is the breaker has to be matched and tested with the installed circuit and the results properly recorded so they can be tested and checked for deterioration in the future. The circuit also needs to be checked for insulation resistance when newly installed.
Your circuit should already be fine on all that criteria so adding a few inches of the same type of wire should be easy. You need to follow the existing wiring exactly if you go about it the way though.