Is there any way to fix Liu Fei's bugged combat voice lines, with mods if needed?

It's apparently a known bug that Liu Fei uses voice lines like "For the North!" and "Steel and Sparks!" in combat in an accent completely different to his personal dialogue. I assume combat voice lines in his own voice don't exist, but I'd settle for him being silent in combat if that's possible? I tried using Fashionist to change his voice type to Silent but that didn't seem to work, and even if I change his gender he still uses the same incorrect voice lines in a male voice. Has anybody else managed to solve this? I assume what's wrong is he's assigned to one of the Northmen factions by mistake so perhaps there's a mod that will let me assign him to a different faction? Any help would be appreciated :)