As of late March 2023 there is still no way to do this. I agree that even a read-only admin is too much access for a user who really only needs to be able to connect to the VPN. I've opened a ticket with Meraki-Go support and asked them to consider this a feature request.
I'm surprised they haven't addressed this yet and am a bit disappointed. Other than this issue I'm pretty pleased with the performance and ease of setup. Just don't want a half dozen admins when all they really need is VPN.
😕