Sonoff zigbee device switch

how would i go about soldering an external switch on the zigbee sonoff, would it pretty much be the same as the sonoff basic video that you created awhile ago? im looking at doing a rocker sw good old fashion way

thinking of soldering on each leg of the push button on the pcb then have that go to a relay with NO contact and that pulses it on and off when the coil is energised. so a standard rocker switch can be installed