An Australian Republic

[Kralizec]

Oh yeah I am hesitant about that, but as long as the position is a fairly limited one then I don't have too much problem with this.

Just rename the current office of Governor General "President" and leave the Commonwealth. Instant republic

It isn't cheaper. The German President costs more than many monarchs, and he does even less than most of them.

I've heard this before, and I seriously question this. I don't feel like looking it up though.
Fortunately it's you who made the claim here, wich means you get to do the work
Remember, you must also include the costs for all the monarch's useless relatives in your calculations

Still, even if it costs more...take the President of Iceland, for example. The veto he cast on the Icesave bill was highly unusual. But at least he was elected to his job (by their parliament)
In contrast, this guy and this guy got where they were by virtue of birth and deluded themselves into thinking it was acceptable for them to refuse signing a law passed by the legislature. That alone is a good reason to be in favour of a republic