Reload inventory variables inside playbook execution

I need create an ec2 instance and execute many tasks on it. For accomplish this, I’ve build two playbooks: one for ec2 creation and other for configuration (package installation, application deploy, etc…). I’ve created a third playbook that calls booth using include statements. I’ve called it instance_up.yml

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May I ask why would you not go with the usual way of adding the newly created instance to a new host group and then configure it? As in the example from the ec2 page:

- name: Create a sandbox instance
  hosts: localhost
  gather_facts: False
  vars:
    key_name: my_keypair
    instance_type: m1.small
    security_group: my_securitygroup
    image: my_ami_id
    region: us-east-1
  tasks:
    - name: Launch instance
      ec2:
         key_name: "{{ keypair }}"
         group: "{{ security_group }}"
         instance_type: "{{ instance_type }}"
         image: "{{ image }}"
         wait: true
         region: "{{ region }}"
         vpc_subnet_id: subnet-29e63245
         assign_public_ip: yes
      register: ec2
    - name: Add new instance to host group
      add_host: hostname={{ item.public_ip }} groupname=launched
      with_items: ec2.instances
    - name: Wait for SSH to come up
      wait_for: host={{ item.public_dns_name }} port=22 delay=60 timeout=320 state=started
      with_items: ec2.instances

- name: Configure instance(s)
  hosts: launched
  sudo: True
  gather_facts: True
  tasks:
    - include: config.yml
    - include: config2.yml
    ....