How do you template A state change trigger for an input_select?

Configuration Blueprints
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1

So normally you would write a blueprint Trigger for a state change & use the !input directly.

E.g. 
blueprint:
  name: test
  domain: automation

  input:
    input_select_one:
      name: One
      description: something
      selector:
        entity:
          domain: input_select
    input_select_two:
      name: Two
      description: something
      selector:
        entity:
          domain: input_select

trigger:
  - platform: state
    entity_id:
      - !input input_select_one
      - !input input_select_two
    id: Input-Changed

action:
  - service: notify.persistent_notification
    data:
      message: "{{ trigger.id }}"

But if you want to make the !input optional, you need to write the trigger as A template, but how do you do this? As an automation it can be done

description: test
mode: single
trigger:
  - platform: template
    value_template: >-
      {{ as_timestamp(now()) - as_timestamp(
      states.input_select.input_select_one.last_changed ) < 1 }}
    id: Input-One
  - platform: template
    value_template: >-
      {{ as_timestamp(now()) - as_timestamp(
      states.input_select.input_select_two.last_changed ) < 1 }}
    id: Input-Two
condition: []
action:
  - service: notify.persistent_notification
    data:
      message: "{{ trigger.id }}"

But you can’t use A variable to do that for a Blueprint, or at-least I haven’t figured out how?

E.g. 
blueprint:
  name: test
  domain: automation

  input:
    input_select_one:
      name: One
      description: something
      selector:
        entity:
          domain: input_select
    input_select_two:
      name: Two
      description: something
      selector:
        entity:
          domain: input_select

trigger_variables:
  input_select_one: !input input_select_one
  input_select_two: !input input_select_two

trigger:
  - platform: template
    value_template: "{{ as_timestamp(now()) - as_timestamp( states.[input_select_one].last_changed ) < 1 }}"
    id: Switch-Changed
  - platform: template
    value_template: "{{ as_timestamp(now()) - as_timestamp( states.[input_select_two].last_changed ) < 1 }}"
    id: Switch-Changed
action:
  - service: notify.persistent_notification
    data:
      message: "{{ trigger.id }}"

Any tip’s would be much appreciated?

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