@Steve *******
As a tourist I have been getting IDLs from the NRMA -which is the NSW Australian multi umbrella insurance roadside assistance organisation - for years. Nothing shonky about these . Read their details . It is my understanding that without it travel insurance in the event of an accident is void.
I also carry my drivers licences from Australia and HK when in Thailand. However , yes they have to be converted to a local license after several months.
Mine is valid for one year.
It cannot be sent to me overseas so must be obtained prior to departure.
I have to provide a passport photo and ID checks for it.