The CBA usually vet the trust deed when the prepare the loan offer documents and a hybrid trust is generally outside of their policy. I think you made the right choice because there's a good chance that the CBA would have baulked at the last minute.
The (very few) lenders who still do hybrid trusts can usually be convinced it's a HDT and fund against it. Been a while since I've seen one but check out:
St George
AMP
RESI
Then tell them to consider an ownership structure that won't shoot them in the head.
