Whole-house Audio Notifications

I'm in the process of migrating the 1980s DSC alarm system that came with the house I purchased, over to Linuxmce. I've moved all the sensor lines from the alarm panel to my GC-100, and I've also wired a doorbell to the unit. Now I'm wondering what to do about the siren and doorbell notifications.

I realize I could have security breaches trigger an event to play a sound file on all my MDs. The problem is that I have my MDs sleeping most of the time, and I don't want to wait for them to wake before playing a siren or doorbell sound. I could play on my Hybrid, but then I get only localized output (won't be able to hear on the other side of the house).

I'm considering adding an additional sound-card to my Hybrid, assigning a squeeze-server to that output, and connecting this output to a distribution amplifier (wired to the existing DSC horns around the house). I would hopefully be able to send commands to this device, when appropriate, to play siren and doorbell sounds (or any other future whole-house notification sounds... intercom?), without interfering with the primary hybrid audio device operation.

Does this seem like a valid approach? I haven't used squeezeserver before and don't know if what I'm proposing is viable.