The only thing to do is create a new module, put it in an existing position (important) and to indicate the name of the css file to include in the page.
This avoids making a copy of the template when you want to make changes on a particular page.
Thank you also to the support of the developer.
Thank you for your review. We use this extension ourselves a lot and I'm glad it can save time to other people as well.
I'm also glad that you're happy about our support level, we strongly believe good support is at least half the value of any extension.