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For your DIY solution this would be possible when everything is controlled from a control panel but I wouldn't want to be trusting one way wireless doorbells or the like with this. My first thought would be using site PA system or class change to get messages out. Clearly a bespoke system like in the link above is a much better solution all round. Was thinking the same, very yellow.

new(er) website looks good

Hi we have a lockdown solution that not only sounds sounders around the school it works with an app. It can be activated from the app so from a smart phone and it will alert everyone in the school that has the app on their phone. It tells you not only that there is an intruder, but where on the grounds that intruder is. We have already installed this system in several schools and colleges. https://www.wakefield-security.co.uk/commercial-security/security-systems-for-schools-colleges-and-universities/critical-incident-management/

intruder alarms ? I'd advise any self employed electrician to make friends with a tame alarm monkey... aka - let some other mug deal with the hassle Its mostly coloured wires & product knowledge, you can do a b-tec or train with tavcom or similar If your foolish enough to want t be an alarm man just apply for job at the biggest co. you can find,

I see the switch mode PSU as pointless innovation...

It's the only thing they make well