Hello all! I was wondering if it was possible to use only sodium cocoyl isethionaye and cocamidopropyl in a Shampoo bar. I'll be adding in other things as well, like BTMS 50 and a few nourishing oils, but would it be possible to only use those two things as my surfactants? I really want to stay away from anything with sulfates and these two ingredients are the most cost affect, sulfate free things I can find so far. Thanks!