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Guys this is quite simple. The volt free contacts aren't in the boiler but in the external controls. There's a voltage of some sort coming out of the boiler hence the link you have to remove when fitting the external control.
wire the motor of the valve through a 240v supply via the room stat, blue neutral grey being switched feed from stat.
the grey wire in the valve connects to one of the external control connections in the boiler and the other connection is connected to the orange. This means that the volt fee contacts are in the valve across the switch. They are volt free when no voltage is connected to them but the boiler sends a voltage out of possibly 24v.
the second valve would be exactly the same connections and you can double up the orange and grey cables of both valves as this doesn't affect the switching of the valves independently
i hope this helps, you could draw the wiring out first to follow the switching and then you will probably have the light bulb moment good luck
youve lost me with your idea there.