Getting good beer in the city centre is a pain. I think heading to DrinkStore would be worth your while -- they had a particularly good line in Scottish beer last time I was in, and deliveries are on Thursday mornings. I couldn't guarantee they'd have anything not in Sweeney's, though.
Or, of course, you could peruse the Bull & Castle's off licence menu over a pint of Hooker.
(O'Hara's is back, btw. Purgatory is still on but Rebel Red has lost out in the re-shuffle.)
And if I were presented with a bottle of Trois Pistoles my first thought would [i:1n0kl0ex]not[/i:1n0kl0ex] be "Damn, I'll need to get someone else to help me with this."