I'm just not sure it would actually be that hard (nor would it be easy to trade George). They are only 2.5 games better than the #6 team right now (Portland), have lost six of their last eight and could easily lose their next five games. Joel's already out today. And the point isn't to get into the lottery, though that would be nice, but to not lose the pick entirely.
To tank, you trade Oubre and/or Yabusele (both free agents after this season) and actually keep some of the dead weight you might have otherwise traded or released at the deadline. While not adding anyone to replace McCain or make the team better overall.
Joel and George missing games or playing but it not being enough for wins probably takes care of itself.