make sure to run this all by Johan! i know the logo itself is trademark, and he might have an opinion about his name appearing on the sticker as well (or the TM being removed in particular)
(maybe you've done this and i just missed it, it'd be a good idea though considering you're wanting to sell them, which he's previously put limits on people accruing profit from if its via the logo)
not trying to be a bummer. prudence pays off