Interesting question, because the same could be applied from the UK ie if i route my IP out of France from the UK could i watch the live tv (Unavailable in the UK) - One to which i also don't know the answer.
Can I exchange the ticket I won in the ballot for a bag of nappies ? edit - brb - on a serious note - I take it that your question is not intended to wind-up STH ....... with all the modern technology & streaming it really is getting to the stage where there is little point in buying a STH ( or any other ticket )................. one of my sons has been able to watch live streams via 'foreign routing 'of his internet.
For those that cannot get to the game you have a couple of other choices... See if a foreign VPN will give you access to ifollow Gillingham FC (Not sure if Gills are offering this as a purchase in the UK). or Go to safc.com and register for a tenner (match price) - please note do this from a laptop or pc...from a phone you will need to download an app.
Starting this year iFollow is available in the UK for full match viewing, this is providing it isn't a Saturday afternoon game or a game being shown live on Sky Sport. This means that the Sunderland game will be available for those unable to get to the game.