Why would there be any ethical issues with genetic engineering?
>the new person you created didn’t give you consent

The child you had naturally didn’t give you consent either, and you still created them.

>it’s not ethical to engineer someone’s DNA

Well, you already do that by having kids.

>it’s simply not right to engineer a child like that

Why? You are what you’re born as. I can’t imagine the majority of kids made like this saying
>actually, my body is wrong and I want to die

They are them, and they are probably quite comfortable with their bodies.