Excellent day today; fixed everything that was going wrong yesterday, and then some.
In particular, I'm happy to get 'fix comments' off my to-do list. It was originally 'figure out what's wrong with Disqus' but the more I looked at it, the more I wanted to get rid of that service altogether.
Skimming various replacements, I took a shot at implementing https://utteranc.es/. Lightweight, saves back to the blog's github repo, looks familiar right out of the box.
Requires a Github account to comment, which could be a stumbling block on a more mainstream-type site; here, that's not a likely problem.
I like it.