I can understand that perspective. But it seems that there are any number of things a parent can do to a child, even permanent things, that are a not seen as a rejection of God's plan the same way genetic engineering is.
If a mother gave her child laser eye surgery to correct his vision, I don't think the Pope would suggest that the mother had failed to embrace the child God gave her. But if the mother had changed the genes that determine the child's vision...that seems to be different.
Why is that? In both cases, the mother is using artificial means to make a permanent change to their child, in an effort to make them more "perfect". What is it about the genetic method that is morally worse than the surgery method?
I would suggest you start by reading Humane Vitae. You're asking permission to rewire the house and install flood lights, while the Pope is asking us to consider the beauty of a sunset, to use a metaphor.
I'll leave it to others to engage in the conversation you are seeking. I think I see the swallows flying over the still lake. :-)