Bone to biped or way to fix animation?

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Hello, everyone,

I have here a bone with animation which I would have to adapt. (in 3DS max)
As you can see in the gif, it's slipping away from its position (at the animation time).

This looks ugly and is not meant to be, because it's a waiting animation.

Gif Preview

I was looking for something and just found out that with a biped model that could use in place feature.

But for that I would have to convert the bone to a biped, which would be a bit more extensive and with several 100 models I still have to work on, too much work.
Do you know a solution?

Thank you guys

Edited September 3, 2022 by Metin2 Dev
Core X - External 2 Internal

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