First, congrats on owning a c4 home! Done right, you’ll come to love it. That was our journey - got into c4 when we bought a house w a c4 system already installed.
Second, I hear you in the need to have your system done your way. Get it. If I were you, I would rethink my reluctance to having a monitored alarm system. It has real benefit that you should think about especially if the previous HO is still paying for it aka call your insurance company and you will probably get a reduced insurance rate having a monitored system!
Finally, there are a zillion things you can have c4 do —like play a specific alarm audio file when a door/window opens and the system is armed— if that is what you really want. Find a quality dealer local or online (nope, not a dealer here) that will walk with you through your decision process and is willing to teach you what the system can and can’t do.
all the best.