[Custom Add to cart on shop/category page] #graveyard

woocommerce.php

function get_woo_variations() {
		global $product;
		return $product->get_available_variations();
}

add_action( 'woocommerce_after_shop_loop_item', 'amend_add_to_cart_buttons', 1 );

function amend_add_to_cart_buttons() {
	if( is_product_category() || is_shop()) { 
		remove_action( 'woocommerce_after_shop_loop_item', 'woocommerce_template_loop_add_to_cart' );
		add_action( 'woocommerce_after_shop_loop_item', 'link_shop_add_to_cart' );
	}
}

function link_shop_add_to_cart() {
		global $product;
		if ( ! $product->is_type( 'variable' ) ) {
			woocommerce_template_loop_add_to_cart();
			return;
		}
		$variations = get_woo_variations(); ?>
		<p>Select an 
		<select>
			<option value="" selected disabled hidden>Select an option</option>
			<?php foreach ($variations as $variation) : ?>
				<option value="<?php echo $variation['variation_id']; ?>"><?php echo $variation['attributes']['attribute_options']; ?></option>
			<?php	endforeach; ?>
		</select>	
<?php }