I'm fairly certain you'd be able to pick up tickets outside the ground/in the pubs around the kop end, although you may have to pay slightly over the odds.
If you have everything booked it would be a shame not to come to Anfield, even if you don't get into the ground, the atmosphere in the pubs close to the ground is pretty good on a European night, I know it's not the same as being in the ground but it would be the next best thing.
Good luck and I hope you get sorted one way or another, hope that helps a bit.
Logged