How do you want to be able to switch between these two pressures?
With the Bleed Valve you can work out your two points (5 and 10) and put markings on the bolt where it needs to be screwed in to for each setting.
Simple pop of the bonnet, unwind the screw until the mark, and you're on your new boost setting. Always go easy and keep and eye on the gauge for the first run after you adjust, to protect against overboosting.
Switching between two levels of boost on a daily basis wouldn't be a great option in my opinion though...
The Engine doesn't run as amazing as it could after a change in boost, you need to get it to relearn (disconnect battery to drain power from the system and reset the ECU) and adjust its maps a little bit to accommodate.
My ECU relearning experience comes from an RB25DET in a S2 33 GTST, so your results may vary...
Its possible, but not recommended imho.