EDIT: It appears I was ninja'd by Botmode.
Well it's possible, as long as you don't use Quickswitching or the scroll wheel changing.
Personally I pull my Melee out with 3, so I bind my 3 key to turn viewmodels on and pull out Melee. And my Q and E keys (Primary and secondary) to pull their weapon out and turn models back off.
It's incredibly simple to write up yourself.
Mine looks like this
bind "q" "slot2;r_drawviewmodel 0"
bind "e" "slot1;r_drawviewmodel 0"
bind "3" "slot3;r_drawviewmodel 1"
Simply change to keys to whatever you'd want to use to draw that weapon.