Be able to change template from a starter template

I want to A/B test landing page themes but I can’t change the theme if the original theme was a “starter” theme.

The reason we cannot track form submissions is that the form is built in a “Starter Template” in HubSpot. Due to this, we cannot add our tracking script and track submissions.
To solve this issue, we need the page changed to a Theme or a Custom Template. However, there is no option to change the template as the pages created with these templates have some limitations. In this case, we would need to manually recreate the page to achieve a similar result