Thanks for all the replies.
I read up on the various types and purchased some
Bodytech Micellar Casein. This looks like it will do what I want and was 40% off at Vitamin Shoppe just a few miles from my house. The unflavored version has literally three ingredients.
Reviews are full of guys who pump massive iron yet the can't seem to tough out a glass of the stuff. The general insistence that food always has to taste good perplexes me but the unflavored version isn't as bad as the crybabies make it out to be. It certainly isn't as bad as say, mayonnaise <shudder>.
The Bodytech stuff is an interesting substance however. It has the texture of talc and gets all over the place just like baby powder. It was all over my black shirt and doesn't mix very well, has to be shaken a lot but eventually disperses.
-Tim-