Well, I know an Archie who does!
My custom dingbat is a little black schooner profile of Rebel Yell. It was created for my as a font on Word, not a jpeg or anything. It was not recognized as a Kindle font, and reverted to just showing an “R”. THe custom font was only one letter, R for Rebel Yell. So in the Kindle version I just used ****. Kindle also doesn’t give you the color cover art by Mark Kohler.