I talked with an electrtian today. I will install a 100A breaker box in the shop, go underground with 4/0-4/0-2/0 Aluminum URD Service Entrance Cable to the pole and install a 100A fused disconnect box below the main service. He will then tap the existing service cables and connect to the 100A disconnect.
Meter--> 200A Breaker-->1.5' cable--> 100A Disconnect--> 39' cable--> 100A breaker panel.
Sounds like a good plan.