Alternatives to handle customizer settings

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.