Actually, discussing this with my camp-mates, a very good point was made.
If:
An Everglowing Ember must be crafted into a torch to be able to light things.
AND:
The resulting torch is no longer a curiosity nor capable of lighting firebrands.
Then this would be the best result.
It consumes the curiosity, creates a new item, and limits its application as an infinite ash generator.
A minor thing perhaps.