Is there any back door way to add pages into the comics, like 10 years ago without clicking down a hundred thousand times? I missed two whole stories.

Unfortunately not. :(

If it were to be done through the admin system all the pages there already would need to be re-numbered one after the other. It takes ages.
You best bet would be to upload them as a new comic and call them “the Lost Stories” maybe?

Might have to do that.