You could also wire 2 services, one to each building. The metering location could remain, as the location of the metering is not the determination for where the service ends. It ends in the enclosure(s) where the main disconnect and OC protection is located. You could even leave the 2-200 amp CBs at the meter (just don't call them the main panel, call them building isolation switches). You have to install main disconnects and OC devices at each building anyway.
This way, each building needs only hots and neutral, no ground. Each building's main panel will be service rated (required anyway). Bond ground rods and metal water pipe (if present) to the GEC and neutral at each building and at the metering structure as always for a service.
