Now there seems to be a mod called Re-Fates that addresses many of the convoluted plot points of Fire Emblem if (
https://gamebanana.com/mods/510547), and even adds some additional gameplay features. Unfortunately, it uses the localization as the base, and the creator decided to not make Soleil's support conversations faithful to the Japanese version out of fear of being called "problematic" or "homophobic".
Likely a product of GameBanana's modding scene being very Tumblr-adjacent. Odd, since video game modding is supposed to be Libertarian in nature.