Since this topic still has some attention I came back to share my solution. I misunderstood the way of making a more simple toolbar. The current solution suites my needs:
if (class_exists('acf')) {
add_filter('acf/fields/wysiwyg/toolbars', 'wysiwyg_toolbars');
}
function wysiwyg_toolbars($toolbars) {
$toolbars['Very Very Simple'] = array();
$toolbars['Very Very Simple'][1] = array('bold', 'italic', 'underline', 'strikethrough');
$toolbars['Very Simple'] = array();
$toolbars['Very Simple'][1] = array('bold', 'italic', 'underline', 'strikethrough', 'link');
return $toolbars;
}
After that, you can assign the field type to your designated field, just like you normally would do.
