I received the sample cable I ordered last week and have given it a quick test at the new Chargefox Charger at Shell Cove. Admittedly the battery was half full so didn’t I get to stretch the charging power. However I saw 48kW for a short time before it tapered off. I don’t have anything to compare to as the CCS1 I occasionally use doesn’t have a display. Maybe someone has more details on the charging limits on the i3. I plan to try at least 1 NRMA Charger in the next fortnight.
Speaking more with the manufacturer in China it seems there would need to be a significant quantity to achieve a worthwhile discount (~50+). I highly doubt there are that many CCS1 i3’s in Australia let alone those wanting an Adapter Cable. The additional costs associated with distribution probably cancel any benefit anyway, as the cable is about 4kg.
Therefore the simplest option at the moment would seem to be via Aliexpress for AUD$745 delivered. It is listed as 0.5m, but you may be able to adjust that (I received 0.3m as per drawing). The price is much better than BMW upgrade prices, as well as the SETEC cable that was said to be US$1000+ when exchange rates were better.
https://www.aliexpress.com/item/4001042456147.html
(Note: GST is added at checkout)
It should be noted that the cable is rated at 150A, but this should be fine for all the 50kW chargers I plan to use.