How can I use the Review Order Pane twice in Commerce Checkout?
I haven't completely tried this out, but you can duplicate the pane by implementing hook_commerce_checkout_pane_info_alter. Something like:

function mymodule_commerce_checkout_pane_info_alter(&amp;$checkout_panes) {
  $checkout_panes['my_checkout_review'] = $checkout_panes['checkout_review'];
  $checkout_panes['my_checkout_review']['title'] = '[Duped] Review'; // to differentiate
}


I don't know what the consequences are of having two review panes, but I think this would be a good starting point.