I have been reliably informed that, following the forthcoming rule changes, the "airwork" category will no longer exist (or will not be available to aeromedical operators).
The aeromedical operators will then have to operate to charter standards, which require the 1.67 landing distance factor for aircraft above 5,700 kg MTOW.
I am well aware of the upcoming rule changes. With a move to evidenced based safety, my take on it is that CASA will not make aeromedical operators change what they have been doing to good effect, provided a strong safety case can be made.
There is also a NPRM regarding aeromedical operations which does have some scope for exemptions/changes to the more stringent PART 119/135.