I have heard that if you have a twin brother that wants to be a pilot as well you only need to study for 7 exams... but sit them at least twice.
However, there is a possibility for you to validate your commercial FAA certificate but you do need some hours, among other things multi crew hours, to do this.
There's also a possibility for you to take your certificate in a country that is soon to implement JAR-FCL. The only problem is that you might need to take the exams in the local language and wait quite a while till you are able to convert that national certificate to a JAR.