There do appear to be some similarities.
What irks me is that you would need to worry about air supply and batteries. I think the electronic system seems to work just fine, but it is too bulky and adds another logistical element.
Kuba, I know you love you 'lectrics but I think it's work looking into either a pop-off piloted QEV (though I think for airsoft and with HPA this is an unnecessary complication) or a direct pop-off valve.
Changing the strength of of the pop-off spring changes both power and rate of fire - lower strength means it fires at a lower pressure, so less fps, but at a higher rate.
Adding a flow control valve between the air supply and the valve can be used to compensate for these changes - it won't be as simple as flicking a switch, granted, but you can tune it for X setting to give Y fps and Z rps.