Eric is right that is a 10k fine, to start and it only goes up from there, for printing a trademarked or registered logo.
John you could be right they may not come after you for doing 1 or 2 stickers, but then again they could. Just have to decide if it's worth it, which it looks like you have. Although now you have posted it for the world to see.
What is raised bubble lettering?
If you change 30%(think that is the right percent) of the logo then you have changed enough of the logo to print it legally.
Not positive on this, but I think that font maybe trekker, but it's kinda hard to from those pics.