I've ported the AXE133 software from the original 18M2, which I 'overclocked' to 32MHz so it receives at T4800 (see above) to run on a 20X2, which is larger, faster and a bit more expensive (3 vs 2 GBP).
See if I could run it at 64MHz and T9600, ... yes it does. And as I expected T19200 was too...