As long as you give it ALOT of time to dry---and air out the viv (make sure even after a few days all the fumes are gone)...it's fine/
I have known many people who have cohabitating lizards of different species doing wonderfully. I also know many CWD's who die mysteriously in captivity....many being imported, others being in shared cages with other lizards.
With many things in herpetoculture, it's hard to lay down a law and say "this is the way all herpers should do things". I try and make informed decisions...and my opinion changes with time because information gets more precise and ideas change.
So, as far as CWD's are concerned, I say right now, at this point in time no---I feel they are way too delicate. But that's just one persons opinion.
Keep in mind though that aussie dragons do not need the elaborate caging asians do. It could be entirely screened , ending up much less expensive....where as you probably know the CWD's require perfect humidity and ambient tempsto thrive. Be sure and post some pics of your completed viv when your done