I think the problem you are running into is based on that Meraki doesn't yet support transition mode with OWE. There you would see one SSID and the capable client would use OWE and the older client would use the standard open mode.
Unless that is implemented by Meraki I would either not use OWE or use two SSIDs with different names like "Guest" and "Guest-Secure".
But I am not sure what you mean with the EAP methods, This is typically related to an Enterprise WPA implementation and will always show up on the client devices.
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