Is it possible to add a line into the checkout somewhere that picks up on the shipping country, that would appear if a customers shipping profile met certain criteria, and provided a link to a popup window with extra information?
eg. {if $userinfo.s_county eq 'Acountry'}<A href="popup.htm">{$lng.lbl_shippingadvicelink}</A>{else}{/if}
The text in the popup being set in languages