I like this idea:
Priority Sorcery/Enchanting Conjurer*
B 9 Spells/Formulae 45 Karma
C 6 Spells/Formulae 30 Karma
D 3 Spells/Formulae 15 Karma
*The Aspected Conjurer's bonus Karma must be spent on magical resources, skills, or qualities before game start. The karma can, without limit, be converted into Nuyen that must be used to purchase magical equipment.
Alternately, you can just give Karma as a bonus to each of the archetypes. A further alternative would include having Qualities purchased with these bonus karma to not count against the positive quality limitation (or even just the first quality purchased this way). I would allow this Karma to be spent on breaking up the Skill Group (if desired) by increasing skills or through Specialization.
This way, the Aspected Magician can actually be better than an equal priority Magician within his specialty and the player can do it in whatever way the player decides (Foci, Lodges, Skills, Qualities, Gear). I don't believe these adjustments make the Aspected Magician overpowered (overshooting the mark), though it might need testing & tweaking.