My suggestion would be to grab the source for a Unix command line id3 tagger, like ID3v2, and a compiler like DJGPP and compile it up. It should work just fine.

Edit: Alternately, install a copy of perl or python and write your own script to do it. You might be able to do the whole process within python or perl (I don't know how much you're doing beyond ripping and tagging). Or find one of the many perl or python scripts people have made available on the net.