They should really collaborate with archive.org. They won't shut things down or paywall it.
I would script that to go over my local bookmarks file.
I bookmark to a service (Linkding, self-hosted) that automatically sends the URL to be archived at Wayback Machine.
But in any case, Safari's reader mode can be scripted from the CLI? That is good to know, maybe I'll try to find something similar for Firefox's Reader Mode. Thank you.