Thanks for such a concise explanation!! Thought that might be the case – might need to consider a switch to abode!

In general, I don’t believe you can, as alarm systems in HomeKit, especially sensors, are only designed to work with their own systems in terms of triggering an alarm, so I’m guessing this will also be the case with the alarm panel. It currently exposes the built-in motion/occupancy sensor, but I believe there’s at least one button that is also exposed to HomeKit, with single and double presses, so in theory, you could use these in automations to turn the Aqara alarm on/off, but it wouldn’t be as deeply integrated like it would with an Abode alarm system. Additionally, you’d still need an Abode gateway anyway, so it’s sort of moot.