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The first two things are doable in an archetype (the second is really simple with an archetype - it's just a single choice in a dropdown on the archetype page in the editor), but adding a second type of spellcasting to an existing class is something that's never appeared in an official 3.5 or Pathfinder class, so hacking that is going to be very complex.
The best route is probably to make the character's race into a racial spellcaster.
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