It looks like they did just that
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, by... just brute-forcing the thing. And it seems to work, as I can take my Kagura save back to the original version by doing the reverse.
What the heck, I don't even have anything to do! Except maybe a script that downloads WolfSave for you and edits
$.Header.Game Name.value
.
For reference and if other people want to try it (and convert their Kagura save), the original Game Name value is
"妹!せいかつ ~ファンタジー~"
(that space in the middle is an
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, not a normal space) and Kagura's Game Name value is
"Living with Sister: Monochrome Fantasy"
.