StreamOfTheSky
Adventurer
Loremaster or Cloistered Cleric both get a similar ability to Bardic Knowledge.
Not in your book list and doesn't fit his race, but Races of Stone has the feats Trivial Knowledge for gnomes and Ancestral Knowledge (ability to make untrained knowledge checks is about the same as having some general knowledge class feature, effectively) for dwarves.
I don't see why any of those things couldn't be adapted to fit the PC if the DM was willing.
Not in your book list and doesn't fit his race, but Races of Stone has the feats Trivial Knowledge for gnomes and Ancestral Knowledge (ability to make untrained knowledge checks is about the same as having some general knowledge class feature, effectively) for dwarves.
I don't see why any of those things couldn't be adapted to fit the PC if the DM was willing.