Rodinal is the oldest commercial developer available, and is available on backorder from Vanbar in Melbourne. Recently I purchased some Efke 50 and developed it in Rodinal - Mixed 5ml in 495ml of water (1+100) developed for 19.40mins at 18.9c
This was taken along the Bremer River in Ipswich using a Mamiya RB 67 Pro S and 50mm lens. The film got a little exposed on the edge when it was unloaded:


I used a little vinegar for stop and fixed in ilford with tendinal hardener. The bright pink Rodinal looks a lot like a vodka cruiser. It would be better to pre-soak films but I tend to be impatient and want to get developing.