Hi Carrie! Didn't realise you have DCs- another dimension to the Aus thing!
Blimey, it gets trickier, doesn't it?
In answer to the OP, I doubt for a moment the school would have a problem with it, especially if your DCs are 'serial attenders'
and aren't in the midst of 'important' exams.
Unless cesspit comes along to defend Australia .. here's another small caution: Despite all the 'Emigrate to the Sun' shows you'll see on telly, state Australian education imho isn't as good as you'd get here in the UK if you were prepared to move into reasonable catchments etc.
Of all the UK people I know who 'emigrated' to Oz for between 2 and 4 years and returned to the UK, 3 because 'it didn't work out' and one due to a contract ending, All 4 have had to get their DCs tutored to bring them back up to speed in a UK classroom. And the DCs were from 6 to 15 years old.
There is a 'she'll be right' attitude that pervades Australian life. It can be refreshing, but it can also mean there's no one challenging status quo's. A good friend of mine in Oz is sighing with relief because she has got her 12 year old DD (who will be 3 months short of her 13th birthday before she even goes to secondary!) a place on 'The Music Programme' at the local secondary which is like a complete, all subjects 'stream' thus, and I quote my friend 'Won't have to mix with the dross'. Unquote. The criteria for entry? Having 'played a musical instrument in primary.' No grade, no attainment. Just 'played'. The alternative 'Programme', and I kid you not, is 'Surfing Studies'.
Australia bristles with private schools (which are way more affordable than UK equivalents) BUT the vast majority are of some religious persuasion. Where we lived, we had a 'choice' of 6: One Catholic, one Anglican (i.e C of E, and usually the most expensive choice!), one Lutheran, one Methodist and Presbyterian, and two Christian Fundamentalist schools, 'fossils-are-the-work-of-the-Devil'.
Finally, even in some top city 'Grammars' (expensive and prestigious privates of varying academia), sport trumps academia every time.
You know, as I type this stuff, I have to say I'm increasingly glad that, despite the rubbish summers, we're here in the UK with the DSs now!