Ok, I can't let this one go by and not comment on it...
While I totally get the not trusting Disney IT thing, you do realize that the tech in the bands and the tech in your hard plastic credit card type tickets is EXACTLY the same, right? There is fundamentally no difference between the two other than the form factor. Nothing is stored ON either the band or the card except an access code that is associated with your
MDE account. Bands (and cards) are merely keys that open your account and allow the tap stations to see the data in your account. You can have multiple "keys". Assuming you have tickets and FP that show up in your MDE account, you could show up at Disney with neither a band nor a card, and Guest Services or a ticket booth could still find you through your email address/MDE account and quickly attach another card or band to your account and send you on your merry way.
Steve