For cold sequencing, each meter needs a disconnect before it, but there doesn't need to be a single disconnect for both meters. Each meter could have its own disconnect before it.
The arrangements of meters/disconnects has nothing to do with transformers.
I can't see how two main service disconnects would work visually.
Right now the service is this, there is no PV-
Two POCO wires coming from the 4 POCO wires running along the road- that's a line and a neutral, so they run 200+ feet from the road overhead to a pole (across one support pole) to a 7200 L-N to 120/240 xfmr, 25kVA.
The 3 wires for the 120/240 run from the pole to a building, overhead, through the meter (it's hot) to the main switch. The main switch is 400A and there are 3 or more load panels from that going to various buildings (one is the residence that isn't supposed to use PV according to the weird rule.)
With the PV (480/277 wye Sunny Tripowers), the service will be changed to 480/277 wye, hopefully 100A and not the standard 200A, because 90kVA of xfmrs for 83kVA of "service" is plenty for 72A max PV output and less than 25kVA max load. (I think)
So that service would be all 4 wires from the road, to the same pole where the 25kVA xfmr is now, running down to the ground with say 3 30kVA xfmrs on a pad, 12.47kV delta on the grid side and 480/277 wye on the service side- from there (the base of the pole), the 4 wires would go underground to the same building (actually a 6x8 foot shed outside the building) where currently the meter is on the outside and the main switch is inside.
The meter can stay where it is, the new meter will go right near it (but not in the same socket or enclosure).
The 480/277 wires will go to the switch first, and then those meters will be cold, but they can't be on the same line because they'd be double measuring something.
So you have to split it there- technically, both meters would still be "hot" after you threw the main switch until you threw the PV disconnect switch.