The underlying problem behind punishing rapists is that they are hardly ever reported or charged, and difficult to prove/convict from there, so your proposition wouldn’t move the needle on that dynamic.
Even if it did, rape/incest accounts for 0.05% of abortions. This idea wouldn’t come close to ending abortion.
BTW, I have also created a policy proposal regarding abortion. It won’t “end” abortion, but it addresses the top concerns about abortion and pro-life laws and will end the polarization. Would you please view it?