Unfortunately, you'll need a DM's help for this. They're undroppable, so you'll need a DM to either pull the item from you and do the whole zap-thing (if that's possible), or one will have to destroy your boots and make some new ones, with the property added (but no light).
Whatever way they can fix it, it'll take a DM. If you have points in Use Magic Device, I'd advise seeking out someone with Boots of the Sun Soul.