I currently boast about 70 unused Jelly Tokens and several Snorbolax Tokens as well.
I would love to see the option of exchanging various boss tokens for spark tokens.
There are crafting mats, and trinkets I'd have plenty of use for and would love to benefit from the unused currency.
Buy antiguas and stuff. Craft to higher level. Unbind em when the center comes out. Your FILTHY RICH! Problem solved.