An interesting idea, but I suspect it just pushes the issue back one more step. How do you authenticate for login to that email account? Specific machines limits but doesn't fundamentally change the attack surface.
If the person has ID, then many options work, but if they don't what can a DMV and trained clerks do that others can't in some way?
Lastly, I'm not from the US but even I've heard that the DMV is a hellish place with queues hours long. Putting more barriers in front of those who are already in a tough spot (and may need to spend that time working, queueing for shelters, etc) is a big ask.