Fallback Devices similar to aliases

Feature Requests
1

I would like to request a UI way to define Fallback devices in case a device/entity becomes “unavailable”. Then it goes through its internal list and “replaces itself” without actually replacing anything in the background with the first fallback device listed, that is available.

Basically this:

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2

I case someone wants it; here’s a fallback light template for a light with a third simple switch fallback:
src: https://github.com/Bluscream/homeassistant-config/blob/main/light/ceiling_light.yaml

- platform: template
  lights:
    ceiling_light:
      unique_id: ceiling_light
      friendly_name: "Ceiling Light"
      icon_template: "mdi:ceiling-light"
      value_template: >
        {% if not is_state('light.ceiling_light_local', 'unavailable') %}{{states('light.ceiling_light_local')}}
        {% elif not is_state('light.ceiling_light_cloud', 'unavailable') %}{{states('light.ceiling_light_cloud')}}
        {% else %}{{states('switch.smart_ceiling_lamp_relay')}}
        {% endif %}
      turn_on:
        - service: switch.turn_on
          target:
            entity_id: switch.smart_ceiling_lamp_relay
        - service: light.turn_on
          target:
            entity_id: "{{ 'light.ceiling_light_local' if not is_state('light.ceiling_light_local', 'unavailable') else 'light.ceiling_light_cloud'}}"
      turn_off:
        - service: >
            {% if not is_state('light.ceiling_light_local', 'unavailable') %}light.turn_off
            {% elif not is_state('light.ceiling_light_cloud', 'unavailable') %}light.turn_off
            {% else %}switch.turn_off
            {% endif %}
          target:
            entity_id: >
              {% if not is_state('light.ceiling_light_local', 'unavailable') %}light.ceiling_light_local
              {% elif not is_state('light.ceiling_light_cloud', 'unavailable') %}light.ceiling_light_cloud
              {% else %}switch.smart_ceiling_lamp_relay
              {% endif %}
      set_level: 
        service: light.turn_on
        data_template:
          entity_id: "{{ 'light.ceiling_light_local' if not is_state('light.ceiling_light_local', 'unavailable') else 'light.ceiling_light_cloud' }}"
          brightness: "{{ brightness }}"
      set_temperature:
        service: light.turn_on
        data_template:
          entity_id: "{{ 'light.ceiling_light_local' if not is_state('light.ceiling_light_local', 'unavailable') else 'light.ceiling_light_cloud' }}"
          color_temp: "{{ color_temp }}"
      set_color:
        service: light.turn_on
        data_template:
          entity_id: "{{ 'light.ceiling_light_local' if not is_state('light.ceiling_light_local', 'unavailable') else 'light.ceiling_light_cloud' }}"
          hs_color:
            - "{{ h }}"
            - "{{ s }}"
      supports_transition_template: false
3

Here’s one for a single fallback fan:
src: https://github.com/Bluscream/homeassistant-config/blob/main/fan/ventilator.yaml

- platform: template
  fans:
    ventilator:
      unique_id: ventilator
      friendly_name: "Ventilator"
      # icon_template: "mdi:fan"
      value_template: "{{ states('switch.fan_socket_local') if not is_state('switch.fan_socket_local', 'unavailable') else states('switch.fan_socket_cloud') }}"
      percentage_template: 100
      turn_on:
        - service: switch.turn_on
          target:
            entity_id: "{{ 'switch.fan_socket_local' if not is_state('switch.fan_socket_local', 'unavailable') else 'switch.fan_socket_cloud'}}"
      turn_off:
        - service: switch.turn_off
          target:
            entity_id: "{{ 'switch.fan_socket_local' if not is_state('switch.fan_socket_local', 'unavailable') else 'switch.fan_socket_cloud' }}"