MaM and Geek and some other sites post a weekly 0-Day dump from the comic usenet boards.
So every week, all the comics for the week a dropped in one bundle. “0-Day Week” is what they’re called.
Make an feed in your usenet/torrent/autobrr client to auto dl these weekly packs. Then in mylar add it to the folder-monitor.
To “quickly” (processing takes a while) jumpstart a collection go to MaM and download entire years worth of comics and have mylar import them all.
Please use MaM as having seeders is really important for all these comics.
This is a long shot, but years ago uploaders would make art pages as signatures at the start of the comic. Is there any place where these are saved?