If you're worried about the magnitude of the quiescent current, you could use your boost converter to charge a capacitor. Run your Moteino from the capacitor and have your Moteino disable the booster after the capacitor is charged. According to the DS, when disabled, the LTC3525 draws <1ua ("typically" just 0.1ua). When the voltage drops low enough, turn it on again. Repeat the cycle indefinitely.
To go even further, perhaps you could also optimize to run the LTC3525 only during its phase of maximum efficiency. That's probably your best chance at powering your Moteino at something near the claimed efficiency...