Santiago Ruiz on "[Theme: SmartAdapt] Creating a Child Theme?"

I very much like this theme, but I would like to modify some of the other elements beyond what is allowed in the customize menu. I tried creating a child theme using the normal method, but, with the way the theme is written, it never looks for the child theme's style.css. In particular this seems to be where that all happens in the header.php file:

//display custom header code (Theme Customization)
   echo  smartadapt_option( 'custom_code_header' );

I'd rather not have to tinker with the php, so I thought I would check here first. Is there a way to make a child theme of SmartAdapt without editing the php?