Only problem I see with this suggestion is that you can't just "Go mage" and expect to truly play a mage.
Sure, you can roll a mage and play just fine, but the true magic will never be there. You see, in the heart of a mage beats an arcane affinity. Fire courses through their veins and their frosty gazes chill their foes to the core.
I mean, go ahead and roll one if you'd like, but unless it's meant to be, you'll never truly be a mage, just go through the motions.
Now, if you truly have the heart and soul of a mage, then you'll know. When a true mage begins to play their class, the universe sings and they can feel that song within them.