Overlay virtual avatars?

Since you don't offer virtual avatars, we wondered if there is a way to overlay video on top of the demo (like on a different layer) so we can create a persistent presence across steps. That way, we can create our own video avatar using a third-party product (something like Synthesia). We like everything else about Supademo by the way, but this is important so we can scale. We don't want to have to shoot dozens of "live" video to have a "human" presence in a lot of the training and sales videos we'd like to produce. Is there a way to do this or is it on the roadmap for sometime soon?