I don’t have a strong desire to debate the topics about wife vs husband interests, but whether or not the state has a vital interest is more central to the general topic of abortion.
The quick and short answer to that is No; the state’s only interest should be in terms of defining terms and making law, while executing enforcement of those laws.
Without going deeper into the conversation you’re asking us to not talk about, I’ll just summarize by pointing out that each state already has laws outlining end of life definitions and who can make medical decisions.
So it seems reasonable to me that beginning of life definitions, lawmaking, and decisions could mostly use the same types of definitions and lawmaking as the end of life laws; such as how medical professionals and the subjects closest family members can assess a subject’s “cognitive agency” and purported will to be treated in terms of life support and life continuation, vs (say) DNR.
An embryo or fetus obviously doesn’t have any cognitive agency, much less an ability to imagine it’s own future, lack thereof, or concern for its own future.