Just as an aside, btw, if you want a remote "disarm", I think I might have found a way to do both a HA triggered alarm and a HA triggered arm/disarm (although this will leave you and the overall system EXTREMELY vulnerable if someone gets into your HA or to the relay, so use with care)
Zone 8 can act as a keyswitch zone, and in momentary configuration can provide a way to flip-flop the system from armed to disarmed, as well as send a panic alarm if the zone goes open circuit. This would need 2 relays but could be viable, although I can't test this myself. Across the "keyswitch" (arm/disarm) NO relay, you'd need a 2K2 EOL resistor (and need to program the panel as such), and then a way to "break" the same circuit with a NC relay to trigger the panic alarm from HA. This setup is described on page 24 of the installation manual for the alarm, but again, use this with care as there is meant to be the additional layer of security with having a "key", but you could use any type of switch (or short) to trigger the flip-flop.
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