I don't think there would be anything wrong going with 50% or 100% hydrolyzed as long as you can stomach it. I've never tried it by itself in those percentages, but bitterness (as you said) is the main drawback from everything that I have read.
Beverly International Muscle Provider claims to be 30% hydrolyzed whey and the chocolate flavor tastes really good, although that company does really well with flavoring their protein. I also use their Mass Amino tablets which are made from a few different forms of hydolyzed protein. They have kind of a nasty aftertaste but work really well. I have been using them as my pre- and post-workout source of protein along with Xtend and Vitargo, and have noticed better recovery then anything else I have ever used (such as whey, dextrose, maltodextrin, etc.)
The quick digestion of hydrolyzed is a gift or a curse depending on when it is going to be used, but it seems to be a very high quality product and when used around a workout is right up there with EAA. What are your plans for use?