It's not entirely impossible but as described above, it's a lot of work and, for me at least a bit tedious. For straight razor quality that can easily be operated behind the back, I would recommend a SE (single edge) safety razor (i.e. Gem 1912 or Lather Catcher). While not quite as aggressive, I've also had good luck with a heavier DE (i.e. Fatboy or Slim Adjustable)