Yair. No probs in giving CTAF taxi and inbound calls on an ATC frequency that is also used for separation. And if there is traffic you can have a good old discussion on how you are going to keep apart .
Who cares if the calls block out an ATC instructions on the busy route above.
They probably arn't very important.
And who cares that the circuit calls are re transmitted across half of Victoria - makes it look busy for the ATCs and may mean a pay rise!