How do I set up a rule to use the chimes on my dome siren?

With LANnouncer, you do need an Android device which can be picked up relatively cheaply these days. If you want to use your existing Dome Siren, it may not be possible unless there is some kind of custom Device Handler that will allow it to make short “chirp” sounds. AFAIK, the only siren that I know that has this is the Aeon Siren. See here: