Well, it looks like I got them all. I think next time I will start with a lot less diluted bleach and vinegar -- maybe 12 oz of each, and then add another 12/12 oz -- one at a time unmixed -- each following day as needed. It seems to have worked well, albeit the vegetation directly adjacent the hole has been wiped out.
I added a quart of dissolved baking soda to neutralize the vinegar the next day after I was pretty sure the bomb was done working.
Do as you will. This is not best practices, and I'm just telling you what I did. I don't recommend you try this, but dang I'm pleased.