Then after that with a letter from your embassy can get a 30 day further I believe.

Essentially yes

Nobody as it more than likely will not be checked anyways.

I'm confused, you need to do a boarder bounce, the alternative on any multi entry is to extend the admitted until stamp, you can do that normally on any of the entries of a multi entry, there is no need to concern yourself with what the aussie embassy is saying. I need to do a boarder bounce myself in due course, and will be obtaining an extension on it instead of risking the leaving and coming back.

Before April 20 go to immigration and get an extension so he doesnt have to go out. Simple really.

Do an extension instead of a bounce

Why not get an extension at Immigration that they are offering

@Weasely *******

take note

Cert is a requirement at every embassy plus more at some others.

You will have to pay a fine on leaving.