I wonder if you could add your own jbst_default_color
filter to the default color value:
$wp_customize->add_setting( 'color', array(
'default' => apply_filters( 'jbst_default_color', $color="#ED9C28" )
) );
where you would add this to the child theme:
/**
* Change the default color
*/
function childtheme_jbst_default_color( $color )
{
$color="red";
return $color;
}
add_filter( 'jbst_default_color', 'childtheme_jbst_default_color', 99, 1 );
to modify the default color settings.
Or even play with the theme_mod_{$name}
filter that is applied everytime your call:
get_theme_mod( $name, $default = false )
where you would be interested in theme_mod_color
.