If your main concern is just the keys file then maybe simply setting up a cron that would „echo "" > .ssh/authorized_keys” would do the trick. But like said - i

If your main concern is just the keys file then maybe simply setting up a cron that would „echo "" > .ssh/authorized_keys” would do the trick. But like said - it's otheriwse an endless cat and mouse game. For examples you can look at King of the Hill CTF games on YouTube