One option I've already thought of, which I might actually do, is use Adventure Game Studio to create animated segments using pictures, sprites, and sounds. This would actually be a pretty neat idea, and with enough effort, would allow me to do full cutscenes with characters following the written script of my video.
I installed a program recently (Natron) that's this kind of compositing tool for putting layers of stuff on a canvas and animating them. Cool idea, but it's honestly such a power-user tool that I can barely understand how to use it.
I've been experimenting with just using OBS and LibreOffice instead, and while the workflow is clunky (LO is horrible), I at least have a way to rig something together and just fake it.