In a way he wants faster than light speed data transfer. I want that too. I do not think this would work out of the box. Maybe if there is a large number of public/private pairs are created before cloning the wallet...
OK, I'm not sure I do get it. It still sounds to me like the solution would be to have a miner run on one machine, and bitcoind run on the workstation-from-which-payments-will-be-made. From a security perspective, the miner would be in the DMZ, and the wallet/workstation would be behind the firewall. What's the security benefit from having a common wallet?