active_callback for a core customizer control

I’m working on a theme but something I’ve never done before is causing some head-scratching…

I have an active_callback set for a few custom colour settings. Checking the checkbox will enable the custom settings (will then show the colour selectors).

I moved the core background colour setting like this:

$wp_customize->get_control( 'background_color' )->section   = 'my_preset_colours';
$wp_customize->get_control( 'background_color' )->priority = 40;

However, how can I get the core background_colour to have my active_callback:

'active_callback' => 'my_custom_accent_colours_show',

Hopefully the above makes sense 🙂