Zigbee 3.0 Green Power Support?

Unfortunately no, I don’t think that will work. Those devices support Zigbee Green Power but they require a Green Power Sink device on the Zigbee network in order to decode the Green Power messages. The SmartThings hub is a Green Power Proxy which means it can receive the Green Power messages from the device and can forward them to a Green Power Sink but it can not act on them on its own (meaning it doesn’t know what button was pressed) because it doesn’t have the Green Power Sink functionality. The Hue bridge has that functionality which is how it can support those devices.