@dg01d As far as I remember, I made copies of all of the posts and then used a combination of very hacky scripts and Text Factories in BBEdit to make the conversion. It took a little while to figure out, but it worked well.
I slipped over on the ice this morning, and now my right elbow has a scar to match my left (from falling off my bike in the summer). It's good to be symmetrical, but my poor elbows... Apparently I fall elbow-first 🙄