Do a fresh Knoppix hd install. Do apt-get upgrade, anser no, and view the list of how many things are going to be updated. Then apt-get remove foo fo2 foo3 foo4 ... fooN of everything you don't want. At least I'm avoiding downloading 280M of updates to (mostly) things I don't want anyway. Then use debfoster and orphaner (which BTW come with Knoppix by default).