can this work for what we need

situation guest mic in sancuary + sound room mic wanted on same channel dont care about seprate vols for ether just want to keep both connected one mic has a on/off other does not

soundroom mic is used to talk to sanc. from the room and also for small recordings for intros/outros

wanting to use

XLR Male - Dual XLR Female

to solve this can it work anyone have one to try this and have both mics work at same time or even only one at a time ?

currious of results

example of cable wanting to use:
http://www.directproaudio.com/product.cfm?directid=26233