CLI mode is an interesting challenge and I'd like to build it. Could you tell me if the animations are inside the figure's FBX or in separate files, and send one figure with one animation for testing? No date promise yet, but I'll keep you posted.
It was basic Daz Michael/Victoria 8.
Since there was very little animations suitable for the games in Daz, I uploaded figures to Adobe Mixamo (https://www.mixamo.com/) and downloaded animation for the figure.
I used my fork of Mixamo downloader to get animations in bulk
https://github.com/ropetight/mixamo-downloader