Glad to hear you enjoyed yourself with the game and Myriam's adventures.
Don't worry, I back up my game data, nearly every month, I back up renders, scene saves and new game version. And there's no worry in the end for my datas, as the hard drive was not the cause of the problem, I should have some more news today if it's due to the processor or mother board.
As I said a few times on the subject, I get the desire of some for some Katherine corruption, but it won't happen due to the important role I gave her in the game. (You can find more details on my FAQ on my Discord if you want.)
After that being said, as you said, if not possible in this project, why not in another one... This join a bit the idea of going into it via extra stories after the end of the game... And the answer would be it's more imaginable that way, but not in the short terme, after Project Myriam, I'll go to other stories and game ideas first, then after some time, when things are running well and I have some good ideas of extra stories, maybe I'll get back to Project Myriam with extra stories (or even commissions in a limited fashion).