It turns out my fears were unwarranted. I do not wish to be so arrogant as to presume that anything would have been changed on account of my comments/complaints on Facebook (which, I had forgotten, the AD can see), but, as the new draft of the script we read in the readthrough today reveals, I actually have a larger part than I thought. And precisely just large enough.
I actually have one solo line, one or two lines said together with a bunch of other people, and(!) a fight and death scene! woo! I get to fight with a broom, get the broom cut/broken in half by a sword, and then killed.
What!? How did this happen? I get to apply my voice talents, and get to do a little swordfighting. How awesome is this?