I severely messed up my tongue on a model months ago, and after contacting support there's absolutely no way to fix it without going in and messing with the mesh myself. I had been editing the facial vertexes and while selecting them to be moved, I didn't realize it was also selecting the tongue vertexes. In the end, I now have the most distorted horrible looking tongue possible, and it has been a nightmare to even partially fix.
I'm hoping in the future you could add the ability to replace a body part with one of the default character model's parts.
Actually you can replace body parts (if you know Blender). Tongue being an easiest.
Check this tutorial: https://forum.reallusion.com/FindPost486003.aspx
In case of tongue, you have to do the opposite with Mask modifier (hide body and leave only tongue).
Let me know in the thread if you need help.
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