You might not want to use the poultry vet with his attitude...
It is not a matter of "if he has to..." comply with the feed directive...it is the law. There is paperwork most don't want to devote the time required.
Talk to your feed suppliers. They already know what certificates you need by Jan 1. They might know which vets can help you. For feed, you need the certificate for medicated feeds.
Any livestock vet can take your feed regimen and work with you. A vet that is overseeing cattle feed already knows the ropes.
Write down the feed regimen you follow. Attach copies of the ingredient list from the feed sacks. Make a list of the medications you use with your poultry and why you use them...any off label use needs an explanation.
Then sit down with your vet of choice to get the Certificate you need for your feed suppliers. Most will be 6 month certificates.
Our vet is in Prague and has already distributed information packets to his customers about the feed/medication directive.