Interesting...any delay of the war helps unite Egypt and Syria though, as Antiochus IV invaded Egypt in 166 or 165 (can't remember!), but was famously forced to leave thanks to the whole "line in the sand" business. If Rome is too busy dealing with Perseus, this becomes a
fait accomplit, and you have your Seleucidity in place to...hopefully get really lucky and watch as someone else blows two-inch holes through Rome's kneecaps.
EDIT: Of course, this has interesting run-on effects. Antiochus is not in a pissy mood from getting WTFPWNED by the Romans, and doesn't enact the Abomination of Desolation in the temple at Jerusalem. He also doesn't go off and try to conquer Parthia right away, and maybe he doesn't catch his disease (is that how he died?). If he lived another twelve to fifteen years, his infant son will actually be of some age, preempting the succession crises that humbled the Seleucids in the first place...