While the workflow is a little clumsy I found a work around for iClone cleaning out your baked vertex animation if you change your weight map.  If you stick it in your clipboard, you can tweak your settings as you need to and then paste it back in place. Just make sure to paste it back in before you bake the next stage of the animation or you get weird results (experience) 

https://youtu.be/Q3MRGedRLgw

Alienware X15 R2 Intel i7 Gen 11 RTX 3070 32 GB Ram 4TB HD
Maono AU-AO4T