Hi denisevv,
I am a German/American and thought about transferring my FAA to LBA. Trust me, you don't want to go down that road. If I were you, I would be more willing to consider the idea of commuting to England. I am based at IAD and I know of several who jumpseat to the UK. I hear it is actually easier than commuting to the West coast. (6 1/2 hour flight vs. 5.)
Since you seem to have a good amount of experience you might also consider IASCO or some other crew leasing company. They often have people based in Europe. I have never heard any complaints about working for them.
If you are set on converting though. From what I learned about converting to the LBA (Germany's FAA), the best way is to go straight to a flight school and cough up the money to retrain. Sometimes the flight schools will have ideas on how to save you money. Since they know the newest regulations regarding training and so on. In addition, you will actually have a CAA license which means a lot in Europe when job hunting.
Good luck,
BBB