It's me again. I have performed modifications of the internals such that when you finish it will automatically save over the pre-existing sprite code from within the Renpy app. Would you be interested in seeing these changes and incorporating them?
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Hi! Sorry for the slow reply, I was having trouble grasping what you were describing and thought it might be clearer if I waited a little but I'm still not quite getting it. However, I am indeed very interested to see your code, and am sure I'll understand it better once I experiment with it. Thank you for going to so much effort!