Z-wave sound sensors to monitor existing smoke/co detectors?

No, that particular device is only available for the UK. UK smoke sensors and US smoke alarms work differently as far as their legally-mandated alarm patterns and go through a different certification process prior to sale.

I know this is an older post, but if your smoke detectors are pre 2005 they need to be replaced anyway!

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If you are in the Amazon Alexa ecosystem, they have Guard feature now that will listen for smoke/co alarms. The newest version of Echo Speaks smartapp can turn Guard on/off based upon ST SHM or Modes.

Yes, that’s been discussed up thread, but it’s only available in the US. Not the UK.