Think the match boycott is a bit of a lost cause, seeing how H&G react to lost matchday revenue, is by looking at their next best asset, the squad, we've seen it already, and it's just the start, don't think more players won't be sold, if the money isn't there to replay the interest, as well as it being difficult if not highly fractious to organise, as it will only attract police interaction and extremely bad publicity for the city in general.
Personally I see the only way of making a big impression, is by severely disrupting the match on a regular basis, so it's looked into by the media, so that it educates the masses/road-trippers, whether that be by continuously throwing balloons on the pitch or whatever(preferably not pitch invasions, as we the fans will only suffer) though saying that a seasons worth of home games played behind closed doors may just make H&G stand up(though can't see that happening without a lot of bad publicity, frowned upon by the outside onlookers).
Leafletting and continued match disruptions is the only way of getting the attention we crave, so that our message gets across.
How about everytime the refs blow their whistles, a YANKS OUT chant goes around Anfield, while the rest of the game, not a single thing is sung, harsh on the players on the pitch, but at least it's an organised clear message that will be heard, as how many times in a game is the whistle blown, while it also being orchestrated by the referee himself, so no crowd disorder as such.
Or possibly a mass KOP walkout after the first 5 minutes of a home game, while the cameras will pick up the crowd being their when the players come out from the tunnel, they'll also pick up on the fact theirs no-one there for the rest of the game, while it also educates the masses that haven't a clue what's going on, as the KOP being what it is/represents to our club, people will ask questions, want to know why/how a whole stand emptied after a few minutes of a home game.