Took me a couple of minutes to find how you add Order actions in WooCommerce so I thought I might write it down for someone else to Google find.

woocommerce_order_actions.php

<?php
add_action('woocommerce_order_actions', 'my_woocommerce_order_actions', 10, 1);
function my_woocommerce_order_actions($actions) {
	$actions['my_action'] = "Do my action";
	return $actions;
}

add_action('woocommerce_order_action_my_action', 'do_my_action', 10, 1);
function do_my_action($order) {
	// Do something here with the WooCommerce $order object
}

I almost had this figured out and this helped finish the process. Thanks!

I was so close.. Thanks dude..

Top man, thanks!