I got a neat supplement that is basically EVERY amino acid. Useful for taking when not eating a full-spectrum food such as meat. Re: the leucine, I doubt there is a requirement that you TASTE it. If it's yucky, swallow it like a vitamin, not in the shake, that's gotta be easier.

I sometimes make protein powder drinks with cream and water and ice. Except I hadn't heard of 'egg-creams' or this idea from the book (I haven't read it). It's simply that I only use cream usually, and it needs more fluid so I add water. I have not yet managed to find any protein powder I don't think is vile, despite probably 25 kinds tried over time. My kid however loves Whey Gourmet's Creamy Dreamy Chocolate, she's 13.