hazelnut, it says in the rules that school opportunities will not count as the 4 required unique opportunities.
I agree with you on limiting what the heir can take to the next town. The only thing I can think of that you can't get rid of is the imaginary friend doll. It might be nice to keep the heirs' diplomas (which aren't worth anything), and of course, any Margaret Vaguesters they've acquired (joke!).