Commerce_stock incompatible with new "Add to cart" button setting

Until recently, there was no way to set/customize the text of the Add to cart button in the UI. But thanks to a new patch, this is now possible through a configuration at the field level by content type (see attachment).

Make "Add to cart" button text a display format setting (configurable at the field level by content type)

Unfortunately, this patch breaks and has no effect when the Commerce Stock module is enabled.

I'm not 100% sure, but I think that the problem comes from lines 137 and/or 258 of commerce_stock.module which re-initialize the Add to cart form. Lines 123-160 are printed below for reference.

It would be nice to review commerce_stock code or module weight in order to allow this patch to do its magic.

/**
 * Form validation handler for commerce_cart_add_to_cart_form().
 *
 * For products with options (product dropdown) checks if the add to cart form
 * should be enabled (in stock).
 *
 * @see commerce_cart_add_to_cart_form()
 */
function commerce_stock_cart_state_validate_options($form_id, &$form, &$form_state) {
  $product_id = $form['product_id']['#default_value'];
  $product = commerce_product_load($product_id);
  $qty_ordered = commerce_stock_check_cart_product_level($product_id);

  // Initialize the form.
  $form['submit']['#value'] = t('Add to cart'); // THIS IS LINE 137
  $form['submit']['#disabled'] = FALSE;
  $form['#attributes']['class']['stock'] = 'in-stock';

  // Set global form for stock actions.
  global $stock_cart_check_data;
  $stock_cart_check_data = array(
    'form' => &$form,
  );

  // Integration with rules_form_alter().
  if (module_exists('rules_form_alter')) {
    // make sure rules_form_alter actions work from the stock event.
    global $rules_form_alter_data;
    $rules_form_alter_data = array(
      'id'  => $form_id,
      'form' => &$form,
      'state' => &$form_state,
    );

  }
  // Invoke the stock check event.
  rules_invoke_event('commerce_stock_check_add_to_cart_form_state', $product, $qty_ordered, $form);
}