I don't rip off old LTO labels that often, but it is very annoying when I do have to do it. Is there a stickerless solution? Perhaps stick on clear sleeves or plastic tabs that hold removable labels?
A dab of rubbing alcohol on a paper towel usually takes the sticker right off in my experience. Or, just put the new sticker right over the old one.
I think you may be overthinking this.
Food for thought: Do you even really want a solution where it's easy to take a barcode label off? If you inventory your tapes entirely by barcode and you need to restore, what do you do if the "easy to remove" label has been knocked off of two of your tapes in transit? You've just complicated your restore immensely.