Hello! Previously, I used the xercapaint mod, but when I saw yours, I fell in love. However, I also have immersive paintings. And it would be great if you could place paintings in these canvas frames or somehow use the drawn to upload to immersive paintings. Sorry for bad english.
Also, this is just a possible suggestion, as now many people use graffiti from immersive paintings as wallpaper and it would be great to draw wallpaper yourself with your mod!

An attempt is also a result.
If it doesn't work out, then, of course, I understand. And if it works, it will be amazing! Can you write about whether something worked out or not, maybe?

Hi, I apologize for the delayed response on this, I was on a small vacation.

I was thinking about this for a couple of days, the idea is interesting. I will do a quick shot at that when I'll have time, but no guarantees -- as far as I know, I manage painting data quite different to Immersive Painting Mod (that was actually one of the reasons why I decided to make my own implementation). To be frank, my time is very limited and there are other important things. If I will be able to quickly make a console command to convert a painting, that might work. If not, I'll have to keep this suggestion for better times.