Thatīs not possible. Nearly all european airlines require a JAA license. There are only a few possibilities for guys with a faa license outside the states. I think some companies in the middle east accept the faa license.
Have a look on
http://www.ppjn.com
The question is, where would you like to be in a few years. If you would like to work in europe, obtain the JAA license.
If you would like to work in the states take into account, that you need a visa and a working permission. You can apply for a J1 visa. With this visa you may stay and work in the states for 24 month. For example itīs possible to work as a flight instructor and build some flight time.
If you hold a valid faa commercial license with multi engine and ifr itīs possible to convert this license into a jaa license. You have to sit the complete atpl theoretical examination with the CAA. For the complete conversion you can expect round about GBP 10.000.
Have a look on
http://www.jals.co.uk/forum/showthread.php?t=148