I know that with the Spellment system being implemented the idea was for being able to transfer an unwanted Lore Spell to the correct school character. An idea that I had was that with the Lore Spells that wizards already have to be able to be transferred. This would be accomplished through transforming Lore Spells into Spellments.
For example: let's say that you get Ratatoskr's Spin on your Myth wizard. You would then be able to transform the spell into Spellments and transfer them onto your Life wizard; and have them learn the spell. The Spellments generated from this process would only be enough for the wizard to learn the spell.