I really like what you're getting at and it's very creative, but I don't think it's the best way to go about it?
I say this because people have their favourite art programs (gimp, sai, clip studio paint, photoshop, etc), and people have already adjusted to like and become very familiar with their art programs. If this were implemented, people would have to get used to a new way of drawing on a different platform which a majority of people have an extremely difficult time doing. I also think implementing this would more or less limit a person's preset making abilities as well, considering special coding like transparent coding, and the limitation of brushes that would/may be available in the preset maker itself.
However, to allow people to use the art programs they want it may be better to just implement a "Sync" button overall instead which a user could press after saving a preset .png image to save a bunch of time relaunching the game and whatnot.