Baileys was available the last time I flew LH longhaul coach (Feb 2010). Dunno about Campari, but they have a decent collection of spirits in mini format. Baileys comes out of a large(r) bottle.

If you are looking for student fares try generation fly: https://generationfly.com/ These fares allow one free change.

http://www.weflyhome.com/ is LH's ethnic travel portal that allows you to pick fares with different rebooking conditions.