shtrom, I've been using #ThreadReaderApp on Xitter to make threads into single pages that I can import into @wallabag (also doubles as an ElonWall bypasser as replies are no longer reachable to unlogged plebes).
I just discovered the Mastodon version, @mastoreaderio. Thanks @badlogic !
It has some JS-loading logic, so doesn't work with the backend-only mode of #Wallabag, but it works fine with the #wallabagger browser extension pushing the rendered page.
It does needs a little #siteConfig magic https://github.com/fivefilters/ftr-site-config/pull/1370. It would be handy to have some HTML5 semantics to find content and author more easily.
But all in all, the basic functionality is here!