It is kind of difficult to understand exactly what you are trying to accomplish here.
Perhaps you cna either clarify for us, or reach out to a local lawyer in private to discuss in more detail.
Most of us here, including myself, offer a free phone consult.
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Talk to a local attorney to discuss.
THIS ANSWER IS PURELY FOR ACADEMIC DISCUSSION ONLY AND DOES NOT CONSTITUTE ANY TYPE OF LEGAL ADVICE OR LEGAL REPRESENTATION.
Why? what is the end goal? Under the Owner's liability statute (MCL 257.401) the owner can be held liable i.e. responsible for damages caused by any authorized driver. You would be exposing your son to potential problems. Consult with a business attorney and do it correctly from the start. GOOD LUCK!