In the interim, most zone valves have a manual open lever...rather than cobble something together that will need to be changed later, I'd just open them. Then, when the boiler and pump are running, they'll pass that through. No neat control unless you want to go shut them down manually, though.
On most, one set of leads is just an internal switch that can be used to start the boiler, the other is the set that provides power to open the zone valve. So, when the thermostat for that zone closed the zone valve by one set of wires, the other would close, telling the boiler there was a call for heat.