Similar to Team Fortress 2 and it changing special event/holiday crate keys to normal crate keys, I suggest, rather than rid of the candies (thus in my mind, work to get those candies wasted) that the candies be changed to normal tokens or other items.
If this has been suggested before, tell me, also tell me if three rings already plans on doing that.
-1 to this one.
Halloween candy tokens are insanely easy to get (you can farm a depth 1 floor for 10 of them per run), and changing them into actual tokens would trivialize the work that goes into finding those real tokens, thus reducing the value of token items to almost zero; not just monetary value, but the rarity and pride associated with them as well. Is that what you want?