Distribution of base voice annunciation

Having only one Annunciation point on a SimpliSafe system creates big issues in a larger home! It's especially important for some alerts, such as temperature sensors, to be heard wherever you are in the home. 

I'm surprised that simply safe did not make their keypads repeaters for the base annunciation! In lieu of this consideration has anyone managed to pipe the base speaker output to the input of a baby monitor and use the monitors remotely to distribute the base voice annunciation?