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Hero
Wow. That makes me 0-for-2 in the past two rules questions I've tried to answer from memory. It's a good thing I always have the books open when I'm actually writing. 
In my defense, however, I'll argue until the cows come home that this is a flawed rule, in terms of flavor if not mechanical balance. I hate the idea of magic items allowing access to PrCs and feats, and I'll certainly be house-ruling it in my games. But as this isn't a house rule question, I should have been more thorough in looking up the answer before declaring it. Mea culpa.

In my defense, however, I'll argue until the cows come home that this is a flawed rule, in terms of flavor if not mechanical balance. I hate the idea of magic items allowing access to PrCs and feats, and I'll certainly be house-ruling it in my games. But as this isn't a house rule question, I should have been more thorough in looking up the answer before declaring it. Mea culpa.