It works, finally.
The only thing I don’t know how to fix is the way the link extends to a comma directly following the reference. If I stopped it from doing that, then it wouldn’t be able to grab verses that are separated by commas.
So for now, I guess that’s just something I’ll have to live with.
If any of you Movable Type LDS Bloggers want the plugin, let me know. I’ll get around to doing some documentation and putting it in a zip file soon.