There are two parts to the question:
1. Will you be accepted in the ME? The answer: It depends on the specific contract (amlost evey airport/ACC/contract is a different ANSP/authority).
2. Will NATS/DFS take you back? Can't answer that question, sorry. Yes some do go there for a few years and come back later. I can't tell you if they got back with their previous employers and what the terms of their employment was afterwards. You will have to ask NATS/DFS.
If you have a European passport then you have many options to go back to in Europe.