Yes you could do the bell thing, it won't be very loud through eves but why you need it louder outside, just have secondary decent internal bell aside of the internal speaker you might have , you want intruders to leave quickly
What's this doing in here then, Met some of your dudes let me have a look but wasn't allowed to try the defib....
He said it's for the lights at back turns them off if no one in there
Go to advent controls online they have one that will do for you
Forget the V2 Tel , it's far to complicated for what you want to do and will make your life difficult
But you have an enforcer better than the other old junk , euro panel and so , so forget the junk for collecting only and get something more
Em complicated , if you can master a dimension you can do any panel, I mean master it not blag it like me