Ability to connect to Home Assistant, via Alarm Decoded or Envisalink boards In What format?
External Keypads and Siren Nearly every alarm panel has this facility nowadays
Ease of connection for central monitoring station such as AMCO (dual path for insurance) You dont want a basic panel
I would prefer the option to also add additional sensors that I missed off via RF as well, even panic buttons etc if that's possible. You want hybrid
All sensors are currently wired back to central location, windows, doors, pirs etc They all do that
When I asked what do you want the panel to do I meant what are you wanting from home assistant IE the detectors in the rooms to talk to your hub and switch lights on and off, when you open a door for longer than 20 secs it switches the heating off. We need to know what format you need it to integrate SIA, 232, 485 or basic input outputs?