Gemini's dll fix for the PC versions already include an option to play all three games in Japanese. For emulating, you'd just need to find the Japanese version of the games.
You need to downgrade the game to DX 11, Non RT version, Go to game, properties, Betas, on the drop down select DX 11, Non RT and let the game "downgrade" itself and then all mods will work again.
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Capcom loves to fk everything up