@brcarls You can configure BI5 to run a local program or script in "On alert..." Your script would encapsulate the if-then logic you require.
If you have Home Assistant (or similar home automation platform), BI5 can send that event with &PLATE value via HTTP or MQTT. Then in Home Assistant, you can configure an automation to do whatever you want, including controlling lights, sirens, etc...
Home Assistant automation would be more configurable since you can add additional conditions and/or other triggers like time of day, alarm system status as part of the logic for taking action.