The only reason I can think of someone would do this is that they don't believe they could get that amendment to pass.
That means you're intending to transfer power to the national government without the consent of the States, and to enact law without the consent of the governed.
There is no legitimate power to alienate the God-given, unalienable right to life of any innocent person. Never has been, never will be.
When it comes to the equal protection of innocent human life, all there is is the absolute duty to protect it.
This is the raison d'etre, or reason for being, of all legitimate governments.
This is the defining first principle of this free republic.
"We hold these truths to be self-evident, that all men are created equal, that they are endowed by their Creator with certain unalienable rights, that among these are life, liberty and the pursuit of happiness. That to secure these rights, governments are instituted among men..."
The consent of the governed, without those self-evident truths, can amount lead to arbitrary mob rule, not constitutional, republican self-government.
The consent of the governed, without the principles of our Declaration, can produce a Gaza, but not the United States of America.