Override price

Try using the following filter-hook, it’ll remove the main variable product and display it’s variations instead:

add_filter( 'wc_zap_mirror_wp_query', function( $args ) {
    // Include product variations
    $args['post_type'] = [ 'product', 'product_variation' ];

    // Exclude the main variable product
    $args['tax_query'][] = [
        'taxonomy'         => 'product_type',
        'field'            => 'name',
        'terms'            => 'variable',
        'include_children' => false,
        'operator'         => 'NOT IN'
    ];

    // Quick fix: variations are not assigned to product categories
    add_filter( 'posts_join', function( $join, $query ) {
        global $wpdb;

        $table = $query->tax_query->primary_table;
        $column = $query->tax_query->primary_id_column;

        $search = "{$table}.{$column} = {$wpdb->term_relationships}.object_id";
        $replace = "{$search} OR {$table}.post_parent = {$wpdb->term_relationships}.object_id";

        return str_replace($search, $replace, $join);
    }, 10, 2 );

    return $args;
} );

Just paste in your theme’s functions.php file.

Worked perfectly but now it shows “out of stock” products.
Is there a way to fix this?

That should do the trick:

add_filter( 'wc_zap_mirror_wp_query', function( $args ) {
	// Include product variations
	$args['post_type'] = [ 'product', 'product_variation' ];

	// Exclude the main variable product
	$args['tax_query'][] = [
		'taxonomy'         => 'product_type',
		'field'            => 'name',
		'terms'            => 'variable',
		'include_children' => false,
		'operator'         => 'NOT IN'
	];

	// Include only in-stock products
	$args['meta_query'] = [
		'relation' => 'AND',
		[
			'key'     => '_stock_status',
			'value'   => 'instock',
			'compare' => '='
		],
		$args['meta_query']
	];

	// Quick fix: variations are not assigned to product categories
	add_filter( 'posts_join', function( $join, $query ) {
		global $wpdb;

		$table = $query->tax_query->primary_table;
		$column = $query->tax_query->primary_id_column;

		$search = "{$table}.{$column} = {$wpdb->term_relationships}.object_id";
		$replace = "{$search} OR {$table}.post_parent = {$wpdb->term_relationships}.object_id";

		return str_replace($search, $replace, $join);
	}, 10, 2 );

	return $args;
} );

Perfect. Thank you so much!