I have a 5-6 player expansion of a board game by another company that included stickers to use on their board and they turned out fantastic. The stickers were made of heavy plastic and are reusable for when you are not playing the expansion. Sorta like a high quality, sticky Colorform.
I am disappointed that the upgrade does not bring the board up to the current rules, but I still bought the upgrade and pre-ordered the expansion.
I want to see a sticker set made, and maybe mail in your UPC from the upgrade box to get it.
OR
Give us a PDF of the changed areas, so we can make a photo paper printout (much easier for FFG).