Well there are a couple routes you could go.
The first and easiest (more costly) would be to have a seperate boost trigger, fia2 and hsv for each "stage".
The second would be to have a solenoid valve on the lower boost trigger jet - this would be a steady rate jet and would flow its max amount for the size of the jet and pressure of the pump. The manifold pressure switch would keep the pressure on this first stage. The existing 2d components would then be used to control the flow of your second stage. The fia2 diagnositics would not respond well to this set up and likely give you false fault signals. I suppose you could also do it the opposite way with the fia2 driving the lower boost jet and an open/close solenoid on a second jet.
I am not sure that either of these would be especially beneficial to be honest, relative to using the 2d to drive two jets. The fuel injection reference will keep the flow at the appropriate level to the load.
Be sure to use check valves on any jets that are post throttle body.
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