What about going to the Frog and Rosbif near Les Halles and the Pompidou? {Though I'd get off at Chatelet if you're on Ligne 1. Only 5 or so mins walk.} With or without PSG mates.
Nice vibe as the name suggests - perfect for Rosbifs who live in and love Paris but sometimes need a pwoppa pub to show their Frog mates.
Can't remember which bit of the 8e you watched the last game in, but given the rule of thumb in Paris is 1.5mins per metro stop it could only be an extra 10 mins or so on the metro to get to Chatelet. {The pub's actually right next to Etienne Marcel metro but that's Ligne 4 so not much use for you, is it?}