Alarm with good internal sounder does th job with some kind of monitoring
CCTV is a luxury
These days it's ring doorbell that has become people's main security
Muppets.....
1. Yes you need port forwarding or update IP manual each time, unless Honeywell have got there act together?
2. No better get installer to update firmware
You could try selfmon service instead can work in conjunction with your gx app
How about install a hkc alarm , stick a wireless contact any old how and follow the zone inside on a sounder , and have app alert you aswell , must be a way ....
What about hot wiring an wireless door bell from Argos , the door bell switch might be able to be operated like that somehow
Otherwise you will have to an on a tx Rx somewhere and spend loads on a chime
Ps does the Optex AX-100TFR cost more than the takex?
Maybe this version isn't correct for your application so explain application and then perhaps go for another model?
Although you can get small low voltage buzzers