What's the best way to get the state for a specific entity of a device?

Configuration
1

I’m writing a script and have added a device selector field and wish to get the state of a specific entity on the selected device.

More specifically, I have several Ulanzi TC001 clock’s around the house flashed with AWTRIX Light. I’m writing a script to allow me to construct a messages to be displayed on a clocks via the mqtt.publish service with a topic of <device_topic>/notifiy. The device_topic for each device is available as an entity on the device (i.e. sensor.living_room_device_topic, sensor.kitchen_device_topc, etc.). In my script I have a selector for a device (filtered to only show the clocks) and would like to extract the MQTT device topic from the selected device.

I’ve managed to come up with the following that works.

alias: Awtrix Send Notification
description: Display a notification on an AWTRIX powered device
icon: mdi:alphabetical-variant
mode: parallel
fields:
  device_id:
    name: Device
    description: Device on which to show the notification
    required: true
    selector:
      device:
        filter:
          - integration: mqtt
            manufacturer: Blueforcer
            model: AWTRIX Light

  # ADDITIONAL FIELDS OMITTED FOR BREVITY

sequence:
  - service: mqtt.publish
    data:
      topic: "{{ states(device_entities(device_id) | select('contains', 'device_topic') | first) }}/notify"
      payload_template: # OMITTED FOR BREVITY

Is there a better way of retrieving the device topic?