I ordered the Mystic Heirloom 2018 stamp supplement, just to see how much hacking it would need. It appears there are only 2 pages that need modification, and those really are optional, and more for the way I collect stamps.
For the Hot Wheels stamps, I decided I wanted to keep the whole sheet together, even though there are two copies of every stamp, and technically none of them touch each other.
So here is what I came up with this morning:
All downloads for these pages and older ones are on my Google Drive.