I imagine it would be possible to simulate either channel using the bright switch, but still, it would be great to have both and the option to jump as with the plexi models.
The JTM45 is close to it, and I'll bet it wouldn't be too hard to change a few parameters to make it more like the Bassman. In fact, the first change I make when using the JTM45 is the tubes to KT66. Changing tubes in the Axe FX is subtle, not quite the same as when changing tubes on my Maven Peal or, in particular, the various Emery Sound amps I used to own, but still noticeable. And, much more so with the current FW.