Great thread! Thanks for making it. 
Also, I agree with @TheMarillFoundation that it would be cool to add the Sample and Three Dollar packs, since those have a lot of cameos as well. Here is a thread of that from 2016: Sample Packs and Dollar Tree Packs (Guide + Gallery), but most of the SM and SwSh era packs are missing.
PS: Seeing this thread reminds me that we should really create a Japanese counterpart of your TCG artwork cameos thread.
Greetz,
Quuador