You might also ask to be able to have unique but low-level magical items appropriate for your party...like a Bowl of Infinite Porridge.
Plus, are you limited to Core + Completes or
WotC only sourcebooks for Feats & Spells?
If not, check out the MiC- as I recall, there was actually an enchantment that lets a weapon re-size itself.
Furthermore, in DCv1, there are a couple of nice Feats, and a couple I think your monk might enjoy. Unorthodox Flurry lets you add a single small weapon to a Monk's "Monk Weapon" list ; Pole Fighter does the same for a single polearm; Ring the Golden Bell lets a Monk use his IUS as a ranged weapon. (For more Monk goodness, follow the link in my sig.)
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