Randy,
If it's not too much of an imposition, can I ask you to make a test print? The platypus design looks good to me but I can't judge how it would look when shrunk to the size of a PGI.
I also have an alternative custom request should the platypus design not work, and that is just the normal white writing on black, but saying 20c, not 25c. That shouldn't be that big a change, I hope...
More on the subject of custom PGIs / requests, how about the universally known symbols for play, quit/exit/eject and pause, such as Pongo's "Set 3" vinyl decals? Can you add these to the collection?