• Crosspost Dreamwidth: https://conlang.dreamwidth.org/
• Posts Feed on Dreamwidth: https://conlangposts-feed.dreamwidth.org/
• Comments Feed on Dreamwidth: https://conlangcomments-feed.dreamwidth.org/

None of these sync comments to their posts. But the feeds use Dreamwidth’s built-in processing for RSS, so they will always be up to date, even if you can’t post to them or comment on them and have it update original posts anywhere else.