I mentioned on the RTK thread that I'd seen Lazio fans completely empty a stand where the Ultra's were based during a game, it was on a programme about them a while ago. They were unpleased with the performances of the club and how it was being run in general.
To avoid tickets being taken by day trippers as a result of a boycott why not buy the tickets, go in the ground, sing YNWA and the players names before K.O. then when the match Kicks off go underneath the stand for the first half. Still sing the songs so the players would be able to hear us giving them our support.
Would grab loads of media attention, provide a striking image (imagine an empty Kop whilst a game is being played) its something different (in this country anyway) and combine it with spending nothing in the ground.
We could even go back up in the second half if the teams struggling and we'd still get to see half the game, it's just be like going to Chelsea in the Carling Cup again!