I understand the concept of psychological warfare, but I ain't sure that this would achieve the laudable goal of freaking out and demoraliing the enemy.
I don't think for a second that Zarqawi or Bin Ladin or el-Masri or the other islamofascist leaders believe in this crap about pigs being "unclean" for a second. This kind of psych warfare would have to be directed at the ignorami who Zarqawi et al persuade to sign on as suicide bombers and supporters.
The al-qaeda leadership are experts at jerking around and spinning stories for these common folk who are their dupes. Beating them at their own game would be hard to do, this game is their bread and butter.
The late Zarqawi and the rest of their leadership are basically just run of the mill international communists and socialists that use the peasants' superstition and religion against them. Pretending as if Bin Ladin, for example, is a devout muslim holy man is just a lie.
Psychological warfare can and should be used, but its hard to do effectively.
President Bush's idea of introducing democratic forms of government address this very idea, as they reduce the influence of the islamofascist warlords and give the peasants a vote.
There is your problem. These people are raised with specific beliefs, pigs being one of them. No matter the perversion of their religion, they still hold the precepts of their faith.
Can it work? Possibly, they are still a backward, superstitious people. It was thought at the turn of the century to probably not be effective, but Pershings use and the threat of use did subdue the Moros.