only one that I judged trustworthy enough to attempt was the chiisui-ton, which

was a bit of a problem, as it had gotten lost during the fight with Herb.  So
had the kaisui-huu, but that was only necessary to reverse the effects of the<<

Why not just implant the fertilised ovum inside Akane's womb and let it grow there? What's wrong with that? If she doesn't want it, I'm sure there's 3 other women who do.