Having had 4 type ratings removed from my licence and to see them described on the back as "previously held ratings", I have to say I am not a big fan of this new system as they would be super expensive to get back as 2 were on light twins, 1 on a medium twin and 1 on a heavy twin.
In my view the people who make these rules are very disconnected from the poor sods trying to make a living flying these things.
Also it is very hard to estimate how much it would cost to get any of them back as the "discretion" of the ATO would vary considerably from one to the other I am sure.
I guess I should consider myself lucky that I still have 1 twin rating current and am actually flying it despite all this nonsense.