It looks like this functionality is already included in "Convenient Horses", but I can't get it to work. In any case, this thread can be deleted --- not sure how to do that.
... which suggested this console command sequence:
prid 7d67a resurrect kill
This resolved the issue, although I'm not sure why, since the NPC "Kjar" sent me on the mission "Harsh Master", which is unrelated to the "Kill the Bandit Leader" radiant quest. Also, the "Harsh Master" quest is nowhere to be found in my quest logs. Perhaps this is something the STEP team may want to look at fixing for a future release.
