I would ask around, try to find another Broker. That is assuming of course that you as Executor are allowed to transfer shares to another Broker.
A few years ago, I had to transfer a CHESS-sponsored portfolio from one broker to another. In that case, I was a Trustee, not an Executor. As I could create the new account with the same name, the new Broker (OpenMarkets) organised the transfer totally free of charge. Had the account names differed, some additional paperwork would have applied, costing a nominal amount: from memory about $50.
Were I in your position, I would ask my personal rep for advice and an obligation-free quote:
Virginia Owczarek
Designated Trading Representative
P +61 3 8199 7704
vowczarek@openmarkets.com.au