Tweaking Keyframes After Recording

[late crown]

Some context: We are currently laying the groundwork for a 3D animated series, and I'm exploring the use of live2D to speed up our process long-term. Our character has a 2D textured face, and the idea is that we can set up a good rig for our character, and do our animation much quicker by performing it though Facerig, prprlive, or something like that - then export as a .MOV for the 3D guys to take from there.

My question is: Does anyone know a way to animate the model using motion capture (in our case, we literally just need the character's face on a transparent background), and take it back into editing so that we can push expressions further than a webcam performance could, and fix mistakes while keeping our overall process much faster than manual animation would be.

[naive pawn]

you can record a motion file on vts, this file you add it again on live2d animation window just to clean or fix anything out of place, and then you can export as a transparent background MOV

[sonic grove]

The VTS thing would work if it were purely 2d, but they say they're making a 3d series with 2d textures
I'd like clarification on that before promising anything...
I don't think a live 2d rig would speed up your workflow very much if they are ultimately going to be 3D models. If it's just the 3D model has 2D textures applied to a 3D mesh (like a vroid for example), you'd be better off recording 3D mocap data with something like iFacialMocap or facemotion3D, then having your 3D team import the animation data as an fbx directly into their software of choice where it could be further tweaked.

Maybe I'm misunderstanding something, and if I am please let me know, but I'm not seeing how exporting the file as a mov would help in either instance if you're trying to avoid having them need to do manual animation work...