Is there any way to use per-face UV for MCreator entities? (without Geckolib)

Hi all, I created my mod in Geckolib (on older MCreator versions) and it has absolutely tons of intricate mobs made for geckolib. Converting them to .obj files is a nightmare due to the issue of converting from per-face to box UV, to such an extent that it completely prevents me from updating my mod. Is there any solution for this, like a way to use per-face UV models for MCreator entities? Any assistance with this issue would be greatly appreciated!