There's a very small handful of lenders who will even touch HDT's anymore - consider the risk moving forward should this restrict even further.
Discretionary/Unit trusts on the other hand aren't a problem with most of the lenders.
Can get 90% LVR resi rates with the right lenders. This is to the max of 4 units on 1 title. Have a chat with an investment savvy broker who can guide you with the right lenders, instead of being in the dark. :)