First ... there's no reason different buildings can't have different services; you don't need to run it all through one main.
Second, you can't do that sort of service change without chatting with the power company. I wonder what they might say.
For that kind of service, you're talking about a CT, not a simple meter. This, in turn, points us toward switchgear. Let Sq D build a cabinet. The cabinets are at least 3R. They make these, to order, all the time. Breakers in the gear will feed your various other panels.
