I am a complete fool. I went through the trouble of making a clone sprite and setting up a system to have the characters flash, when it turns out - I never noticed that the "._mainSprite" was the actual bitmap being used. I'm happy since that makes compatibility easier, but I also want to scream.
Wondering how to force a Save State in VNMaker with a name and how to call it with a scene event in order to double check if this Save State exists or not. Phew... Leaving breadcrumbs for chapter DLCs to pickup would be more than half the fight in order to finish this visual novel