GPON fiber solutions is typically just a layer 2 transport so though the gear may not  be Meraki, I don't see why you couldn't have a Meraki switch connected to a GPON ONT through your fiber cabling to a GPON OLT where it uplinks to a Meraki core/MX Appliance.  Network topology view would still show non-Meraki components as long as it supports CDP/LLDP.  Maybe I am wrong, my wife says I am all the time. ... View more