A bit of poking at search engines turns up nothing. A bit of poking at Reddit turns up a 16-day-old post with no responses and a 4-month-old post complaining that--among other things--wget has never been any good at downloading embedded images with off-site hosting. Depending on how strict its definition of "off-site" is, that might explain the problem: in any case, if true it suggests a bound on how useful a solution can be.

Found a basic WARC-to-HTML converter, with a reasonably reputable creator. Can't find a way to get it to convert the links and embed the page requisites, but it means I can store things in WARC format and produce Recoll-indexable versions locally as needed.

...it looks like it may be possible to run warcat *through Termux*, creating crude-but-not-useless(-and-no-worse-than-current-wget-outputs) mobile-readable versions locally as needed. BRB.

[...]

Okay, it's expensive if you weren't otherwise going to have Python installed on Termux (warcat itself seems to be tiny, but Python consumes 327 MB of storage space), but I *did* manage to extract HTML files from the WARC scrape of my Dreamwidth using only my phone. (Well, I looked at stuff on the Termux wiki on my laptop, but I *could* have done that part on my phone too if necessary.) For some reason Material Files isn't offering me the option of opening HTML files in my browser, but I can get raw HTML directly through Material Files or open a somewhat-less-raw version in my ebook reader. The formatting sucks, and I hope I am never desperate enough to need to resort to this sort of thing, but the option *is* there.