There was a bit of this during a past world event that allowed us to exchange former world event currency into glass beads. A full scale version of this (at least during a world event) would be really helpful to allow players to use past world event currency in too small of quantities for purchasing items of it's own type. Also, the reverse conversion allowing current world event currency to exchange for past world event currency. I have a couple of recent characters I would like to convert world event currency into different types so I can purchase some items from past events that I enjoy on my year+ old characters. I think many subscribers would enjoy this ability.

I appologize if this has been suggested already.