Q 4 Is there a base class arcane spellcaster that gains spell progression like a wizard, but uses Charisma instead of Intelligence?
Not that I can think of.
Alternatively: Kobold sorcerers with greater draconic rite.
Anyway, what feats are there that change your type besides
-otherworldly (outsider)
-dragonwrought (dragon)
-human heritage (humanoid(human))
Being able to swap around your type after applying a template is pretty cool.
Actually, is there a type-changing handbook?