IT WORKS! (/loadUI) (or I'm an Idiot)
 

*EDIT* wow, now I feel like an idiot

:p

It's got various degrees of working-ness for different people. I can do /loadui on my system, and the game doesn't crash until I zone, attack something, or use an ability that brings up the Casting window. Turning Autoattack on while targetting something out of melee range causes the dynamicdata to update.

But I gather that most people's game crashes immediately or after 5 or 10 seconds regardless of what they do.

I've never had EQ2 crash on me from using /loadui, but it does totally mess up my knowledge book, tradeskill recipe list, and pretty much anything else that requires a good chunk of server-side data. Maybe I just never did anything that would trigger a crash after noticing it borked a great many other windows. :D