I'm not sure if I could make such a thing, I have no experience in any program you mentioned and it was probably a "what if" question, anywayIn addition to my comments above:
Here is an example of how I made a test animation with Blackjack.
I imported the revamped pony model version 6 into Blender, the default skeleton is not convenient for animation, so I had to create an additional control rig. Once I had linked the default rig to the control rig, it repeated the movements of the control rig, and once I had created the animation for the control rig, I "baked" the animation for the default rig. Then I exported it in fbx format and then took the Config.txt from the Lyra's Recruits custom animation that was added to the game by the author and used it as an example to create a conifg file for my animation. Something like that.
Maybe it's easier to create animations with Sours Filmmaker because you don't have to create a control rig like in Blender. I just haven't used Sours Filmmaker and it's just easier for me to use Blender.
Thanks for the answer