Core Roman influence in Germania, Northern and Northeast Europe, Iraq and Caucasus: Possible?

The regions I've mentioned are the borderlands of the vast Roman Empire which had little influence from the Graeco-Roman World during the Roman rule.

Do you think it's possible to have a Graeco-Roman influence in this region to the same extent as it happened in Gaul and Hispania, where the Gauls and some other Celtic people joined the Roman Empire en-masse and the regions became fully Romanized?
 
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