Include less file in head script in Theme

#if(true)
    <meta key="hf-test" content="$page.MetaTitle" />
    <link type="text/css" rel="stylesheet" href="/cfs-filesystemfile/__key/themefiles/f-s-3fc3f82483d14ec485ef92e206116d49-files/mystyles.less" />
#end   

I think I need to get a different type of executed URL for a supplementary theme file from within the HeadScript area of the Theme.

You should use core_v2_widget.GetExecutedFileUrl(fileName). This will retrieve the processed file location (which is lazy populated) for LESS/CSS files.

Will this work within the HeadScript in Theme Studio as well?

Will this work within the HeadScript in Theme Studio as well?