I don't think you realize that what you claim here undermines your compromise.
Going back to the airplane over the Pacific, the unconscious person is neither invited nor being rescued. So why is it wrong to throw them off? According to your compromise it isn't. But the reasons why it's wrong is hidden in the same reasons you can not justly throw someone off your plane over the Pacific who you've invited or who you are rescuing.
Granted, as you'd agree the beginning of understanding reality is "I exist" and thus all humans most personal possession is their own self. And after we establish our God-given reality, we must live together in wisdom, which begins with the fear of God. And wisdom says we must respect the God-given life of every human. We merely have to determine when a human begins.
Greater than what? What are you comparing here? One is the greatest possession of a pregnant female, and the other is... the baby?... other humans in society?... the father specifically?
This is just another example of why IP does not exist. If this were a reason to kill someone, the father would have a claim to the contrary! It would even have to be argued in court even if the father were a rapist. Are you sure you want to make this a part of your argument?