Car Heater (winter is coming) need coding help!

Configuration
38

Okay so i got a functioning automation:

id: '1613303438594'
  alias: carheater_master
  description: ''
  trigger:
  - platform: template
    value_template: "  
    {# This is a jinja comment and will be ignored by the interpreter#}
    {# ALL the below is indented more than it needs to be to show the comments more clearly #}
      {# This next line (all comments will be as this) gets the time RIGHT NOW and stores it as a number in seconds from midnight. #}
      {% set timenow = now().hour * 3600 + now().minute * 60 + now().second %}
      {# this sets your 'settime' as a number from your input sensor and stores in settime #}
      {% set settime = (state_attr('input_datetime.motorvarmare2','timestamp')) %}
      {# this gets the temperature (as a float, as that will aid in resolution) #}
      {% set tempdeg = states('sensor.termometer_ute_ch4_temperature')| float %}
      {# this gets the minute offset from the start based on the temperature#}
      {% set offset_mins = ((-2 * tempdeg) + 60) | int %}
      {# given the 'offset' we now have a new 'start time' calculated, based on temperature #}
      {% set heatstart = settime - (offset_mins * 60) %}
      {# this will render true when its time to start the heter and trigger the automation #}
      {% if timenow >= heatstart %} true {% else  %} false {% endif%}"
  - platform: state
    entity_id: input_boolean.motorvarmare2
    to: 'on'
  condition: []
  action:
  - service: switch.turn_on
    data: {}
    entity_id: switch.shellyswitch25_84cca8b07a6d_channel_2
  - delay: 02:00:00
  - service: switch.turn_off
    data: {}
    entity_id: switch.shellyswitch25_84cca8b07a6d_channel_2
  - service: input_boolean.turn_off
    data: {}
    entity_id: input_boolean.motorvarmare2
  mode: single

But now i can’t get the blueprint to work properly.

the blueprint now looks like this:

blueprint:
  name: Carheater based on outside temperature
  description: 'Will start the car heater based on the formula y= -2*x+60 meaning 0deg C= 60min, -15deg C=90min Note: Requires two helpers Time(input_datetime) sensor with time only and toggle(input_boolean) for manual activation. Configuration->Helpers->add helper'
  domain: automation
  input:
    switch_entity:
      name: Car heater outlet
      description: The outlet to control.
      selector:
        entity:
          domain: switch
    timestamp_sensor:
      name: Alarm timestamp sensor
      description: 'Sensor with timestamp of departure time'
      selector:
        entity:
          domain: input_datetime
    manual_boolean:
      name: Manual activation
      description: 'Input boolean used for manual activation'
      selector:
        entity:
          domain: input_boolean
    outside_temperature:
      name: Outside temperature sensor
      description: 'Outside temperature sensor'
      selector:
        entity:
          device_class: temperature
    delay_time:
      name: The maximum time for the heater to run
      description: 'The maximum time for the heater to run, default 2h'
      default: 02:00:00
      selector:
        time:
variables:
  sensor: !input timestamp_sensor
  outside_temperature: !input outside_temperature
trigger:
  - platform: template
    value_template: "  
    {# This is a jinja comment and will be ignored by the interpreter#}
    {# ALL the below is indented more than it needs to be to show the comments more clearly #}
      {# This next line (all comments will be as this) gets the time RIGHT NOW and stores it as a number in seconds from midnight. #}
      {% set timenow = now().hour * 3600 + now().minute * 60 + now().second %}
      {# this sets your 'settime' as a number from your input sensor and stores in settime #}
      {% set settime = (state_attr('sensor','timestamp')) %}
      {# this gets the temperature (as a float, as that will aid in resolution) #}
      {% set tempdeg = states('outside_temperature')| float %}
      {# this gets the minute offset from the start based on the temperature#}
      {% set offset_mins = ((-2 * tempdeg) + 60) | int %}
      {# given the 'offset' we now have a new 'start time' calculated, based on temperature #}
      {% set heatstart = settime - (offset_mins * 60) %}
      {# this will render true when its time to start the heter and trigger the automation #}
      {% if timenow >= heatstart %} true {% else  %} false {% endif%}"
  - platform: state
    entity_id: !input manual_boolean
    to: 'on'
action:
  - service: switch.turn_on
    entity_id: !input switch_entity
  - delay: !input delay_time
  - service: switch.turn_off
    entity_id: !input switch_entity
  - service: input_boolean.turn_off
    entity_id: !input manual_boolean
mode: single

but apparently having variables in triggers is not supported…

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