Woochimp / Mailchimp ecommerce 360

We currently use the popular Woochimp plugin to connect our woocommerce store to mailchimp. We are looking to start using ecommerce360 within mailchimp, a feature Woochimp currently supports and works well for new order moving forward. However, we need to push the data from all our previous, completed orders to mailchimp too. I have reached out to the developers of woochimp for assistance with this but they don't do custom work. They did say this was achievable using their current code and making slight tweak to their code. The plugin's code currently uses the order_id variable to get and push the data to mailchimp. We need someone to create a script that will get all order_ids for completed orders only and then use the plugin functionality to push the data to mailchimp. Note: you will need to test this on your own testing platform and mailchimp account first. Once you have a working code, we will run it on our site. We cannot give you direct access to our WordPress installation for data protection purposes. We are however always available and will work with you to quickly get this completed.