This was announced a good while back, though it took some time to come to Australia. Not entirely sure when it did, but now you can use your existing Aussie account and convert it to a developer account for the princely sum of $0 (and zero cents). Got another Series S the other day (third S, plus an X) and as far as I know, the limit for 3 consoles as dev units is still in place, so I had to make a new dev account, fortunately, I could just make it on my real account now, for free, which is swell. A good few steps easier than signing up a Turkish account to get the discount like I did a couple years back.
I'm not 100% if I'm allowed to link to the emulation scene, but with DevMode, your Series console can do PS2 era games flawlessly, can also do 90% of the Wii library (albeit usually with flawed controls) and a good portion of 360 games, hell, there's even a work in progress PS3 emulator now. Anyway, Google XBSX2.0 and you'll find your way ;)
This explains so many of your comments on PS5 posts now.