Swap SVG icons in child themes

I see that both icon arrays ($ui_icons and $social_icons) in Twenty Nineteen can be accessed publicly, so I managed to replace any icon via the init hook in a child theme. An example:

function child_init() {
    TwentyNineteen_SVG_Icons::$social_icons['instagram'] = '<svg>... Insert new Instagram icon SVG code here ...</svg>';
}
add_action( 'init', 'child_init' );

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