Yeah, sorry for the derail.
Arcane Theses could be handy...Cooperative spell and Energy Substitution each allow 1 more MM for the AT spell(s), Sanctum spell does too, but it lowers effective spell level (there's a trick there), and some MM's are 'free'. Blistering Spell (+1, so free for AT, +2 damage per spell level, minor debuff), Sculpt (New area type for area spell), and Transdimensional (affects incorp, ethereal, extradimensional each fully) stand out, outside Core. Additionally, Split ray and Explosive spells are reduced to +1.
The dirty trick for Sanctum Spell: sanctum spell + arcane fusion = infinite lvl1 or lower spells
sanctum spell + greater arcane fusion = infinite lvl4 or lower spells
This takes into account mm feats on each spell. Each of them.
You need Rapid Metamagic, or Rapid spell to pull it off, but if you do, you could have a lvl 1 or 4 Arcane Thesis blast cast as many times as you like. Possibly a great use of a 5th or 8th slot.
Consider Wu Jen (Bonus MM feat at 1st), and a Spell Secret, Elemental Mastery. Downsides are a small expanded list.
Magical Trickster (CSc) gets a bonus MM feat, plus 2/3 levels count toward another class's abilities. Mage of the Arcane Order can help with spontaneous spells when you really need 'em... and the Trickster could advance it a couple levels
Evocation Focused Specialist, Master Specialist...might shoehorn you too much...
Consider sorcerer with Arcane Preparation feat (CArc) to get into MotAO, and mitigate MM speed costs. Though Rapid Spell (CDiv) should fix that nicely on any Arcane Theses you have.