Interesting but not surprising that most people ignore the important part.
Dave says that Jose added an extra gain stage (a tube, using one half of it) in front of the circuit. He also mentions that the coupling cap was .022.
"Most of the Jose's did not even have the clipping diodes".
We have the clipping diodes available (saturation in Axe), that's easy.
Now, which amp models in the Axe are based on old four input Marshalls but have an extra gain stage in front?
I'm guessing there may be a Splawn or Cameron that would be close.
The Kasha Rockmod II preamp is also based on this topology, adding a stage before the Marshall preamp. This also gives you two gain pots like Steve's amp.
