Like others have said I don't believe anyone is going to 100% have that answer for you but I do believe they would stay. Reason being is usually systems like this (motor drive systems in general) will be using gearing as the mechanical advantage to change position which is why they don't need some huge motor drawing lots of current and building heat. That said it means going the other way (driven gear driving the drive gear) you will have a huge mechanical disadvantage and be very hard to change position.
A seat track is a great example, even if the motor dies and you remove the motor it is still impossible to move the seat and you need to manually drive the drive gear with a drill to get the seat to move and gain access to the frame bolts (ask any Mercedes tech how fun it is when they fail on clk's).
Now the concern I would have is that it is possible from what I've heard to have the valves hit the pistons if the vvel isn't programmed right (tuned right). So with that I'm not sure you can "lock it" at max lift and still be safe (not sure how the vvel valve position interacts with the VTC valve timing events).
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