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Small amounts of dried coconut would be ok.
I use pumpkin seeds in the shell so they have to do a bit of work for them rather than just getting the seed for free! You can't get them in the supermarket though, ratrations do them.
As you've got all those monkey nuts you could make a small hole in the end just big enough to get one nut out then put another treat he likes in there so he still has to work for it, I often put small seeds in when they've finished the nut.
You can wedge seeds into the whimzee toothbrush as well, a bit easy for them but still gives them a bit of something to do.