I was thinking about that at first, but I think I'll just live with it. Lost bike customization that I never even had before the dlc is a minor inconvenience at worst. Just hope if anything else is glitched I notice it sooner.
I did try removing the God Egg to see if it would change anything, but most likely if it did, the damage would have already been done. I also tried contacting Nintendo support on Thursday when it happened, but I've been waiting for a reply still.