The conversion should give you a pretty much "clean" AFK version of the ORBed area, minus a couple of things like the economy stuff, which is now, um, something other than the economy stuff that I can't remember at 10am. Otherwise it should be fine.
Obviously once you convert, the format has changed enough so that you're not going to be able to use ORB on it anymore. There's also a not-insignificant amount of new flags and such that have been added, not to mention the change in weapon values and a number of other things that I'm not remembering just now.
And it's probably wiser to OLC as much of the area as you possibly can get away with, if for no other reason than you'll have all the stuff there to work with. There's obviously no AFK OLC doc as such (I should probably make one, yes), but we're not so dissimilar from regular SMAUG OLC that you shouldn't be able to use a regular doc to find your way around. Help redit/mset/oset should at least get you started, as well as the immortal university. And I or somebody who knows what they're doing is pretty much always around either here or Alsherok.