Check out the new initiative called EURATCO on this website.
www.safeskys.co.uk
Look at the page entitled European Common Licence
This is the only recruitment agency dedicated to placing European ATCOs at European Airports. It is managed by current licenced European ATCOs so they understand the profession. It is a new service and is still in the start up phase but it is planned to be the first port of call for ATCOs looking to move when the new ESARR regs are ratified
Good Luck