When I saw Pixaki could use the iPad’s pasteboard, I tried copy-and-pasting existing pixel art into Procreate, which has an 1-pixel brush installed. I enlarged the original three times, recreated the color palette, and drew over it in a new layer. I can see that having value, though it’s very slow.
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screenshot of Procreate app on iPad, showing pixels drawn over 3 times enlarged original.