Have y’all beeen in contact with this guy?
https://captrobau.blogspot.com/2020/06/upscaled-to-4k-using-ai-powered-video.html
He has been able to achieve some good results. Not sure what his method is.
Actually he is one of the reasons I started my project. I also drew some inspiration from his approaches in the past. I go a little different about my project, but I am using similar software.