Hello,
As explained previously, that's the only way to do it using the current version of phpdocx. If instead of creating sections dynamically, they were fixed then you could use a template.
About pricing, there's a test license with up to 50% off. You can read about it in the banner available on http://www.phpdocx.com/updates
Of course, we'll consider adding that feature without need to use the merging class. It's not a common request and until now the users that have needed to accomplish it are working perfectly and without issues using the merging class.
Regards.