I know 0 about alternatives, so take this with a grain of salt. But I remember comparing just the raw nutritional numbers between this BioChem Chocolate Fudge Protein Powder (no soy, it's whey based protein) the the IP chocolate drink mix (which also is whey based) ... and the raw nutritional numbers were pretty similar. I think this product did have a bit more sugar, 7g vs IP's 4g. But I think it could still work. Even drinking this 3x a day and getting your sugar grams up to 21, it's still considered a low sugar diet (which would be anything under 60g a day). My strict IP Diet, gets me to 27g of sugar a day -- just my 4c of broccoli I think contains 10g of sugar in terms of nutritional components.
This whey protein powder made by Bio Chem. Amazon probably sells it -- and it got a lot of good reviews on Amazon too.
I bet you could get to IP-like numbers if you used this to make chocolate drinks 3x a day and then had the 4 c. of veges and 8 oz. lean protein and lots of water. I realize that not everyone can afford the IP packages, so you make do with what you can afford.
