The NZMCA’s volunteer certification service is not available to non-members, however there are other people and organisations who may be available to assist you (at a cost), for example:
DISCLAIMER: Please be aware however that the NZMCA does not endorse other issuing authorities operating under NZS 5465:2001. The NZMCA will only accept a self-containment certificate issued by another issuing authority if the document has been completed correctly and the vehicle clearly satisfies the full requirements of NZS 5465:2001.