Did you repeat the implant application?
From what I read, it's not a one and done but a semi-yearly treatment.
@jonaeselaye maybe I missed it, but how old is your bird?
I really don't think many have done it, and those that have had varied results.
If you're in a hurry maybe just have it done and see if it works....then you can add your experience to this thread
There are a couple rooster stories in this thread, did you read them?
I'd think penning him until he's older would be much easier, cheaper , and guaranteed.