Some judges will literally overrule prenups because they would have worked.

They will also overrule them because they were signed under "duress," because that voids most contracts. Except the "duress" in this case is asking her to sign a prenup, because she is now "coerced" into signing it by you holding the marriage hostage until she does.

So its basically a small extra obstacle you can add to maybe hope the judge doesn't side with the crying woman with the kids and no work history over you.