

An odd pair of chromosomes makes it harder than being off by a pair. Mules are unbreedable due to their odd number of chromosomes.
We have successfully bred with species further apart, including an alpaca and a llama.
So yes all the science points to it being possible with humans, but ethically we can’t possibly do that.
And it is not one more mutation to add an extra chromosome. It’s a loooot more.
You’re making the error of assuming conservatives have a status quo, or a party line, or any agenda other than being evil.