Mercury Based System - Valid Card Read With An Active Momentary Key Switch To Shunt Alarms

On our existing Schneider Continuum access control system, we have several instances where we utilize a valid card read in combination with an active momentary key switch to shunt motion detectors and door status switches in the adjacent area. A second activation of the key switch puts the area back into secure mode (alarming the devices). Much of this is accomplished with the Plain-English language built into Continuum. I am looking for a way to accomplish this on any of the varied Mercury-based access control offerings as is - without having to change the key switch for a key pad etc. Any ideas?

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