I thought it was a good idea, and more l4b things would be nice, lol. More variety. And maybe NOT the wandering witch idea, kinda obsolete. (I think so.)
The tank does what the charger can, just has more health and damage. (a.k.a., edit and give credit.)
Though the spitter would be a revolution and the jockey would be kinda cool.
I'm too lazy to script it all out.