Characterize existing model in 3D Max for Motion builder animations

I need to standardize existing model prepared in 3D max:
- model is in max format
- model is rigged

Issues:
- rig doesn't respect 3d max naming conventions
- rig doesn’t have T poses

According this issues model cant be Characterized. So I need:
- Fix the model according 3d max conventions
- Characterize model
(Model must be prepared for MotionBuilder animations)

Model:
https://www.turbosquid.com/3d-models/3d-fantasy-baby-lion-animations-model-1651612