you will need a 12v base / clean switch but the theory is sound. just bear in mind you need them well placed as if the cable/panel etc get compromised it cant do its job
professional grade wireless sounders will do 2 years but it does depend how often you set it off. Pretty much all decent gear allows for a wired sounder.
But you have defaulted in since and default is circuit 2 walk through
Have a look at page 21 where it talks about programs 1,2 and 3
Id assume your using program 1 as full set and program 2 as part set