The Brahmas person did clarifie with me that this behaviour of his is just him trying to mate with me.. No thank you!
I'm not suggesting to cull your drake. I have not witnessed the behavior of your drake. I'm just saying that perhaps he is not the best choice for your breeding program. An alternate option might be to purchase fertile hatching eggs to pop into your broody duck nest.
I do own a drake. I got him as an adult and have had him over a year. He has never attacked me. Not all drakes are aggressive to people. He has never once so much as grabbed an article of clothing or nipped at a hand or ankle. I would certainly consider using him for breeding. BUT despite being gentle with people I did have problems when trying to integrate ducklings as he was quick to protect his existing flock from the new intruders. This is why I caution you that trying to add ducklings into the flock that were incubator hatched and brooder/human raised. It can be tricky even with a docile drake, which you do not seem to have.