I really wonder how much life you will get out of the halfnuts. Maybe better have a few extras in stock I don't know if those things are all that cheap, either.
Having used a cnc lathe myself with a bit of backlash in X, I would bend over backwards to avoid it. It just rears its ugly head just when you don't expect it. For example, suppose you are turning a long slender piece and you want to program a slightly modified path to counter the flexure and get a straight cut. This will be an in and out motion with backlash only being a nuisance.
Suppose you want to turn an external taper, getting larger towards the chuck. In order to overcome the effects of backlash, you are going to have to make an initial movement in X+ to take up the backlash. Now as you turn the taper additional X+ movement is required. However, the force of the work acting against the tool will move the cross slide outwards in uncontrolled amounts, because it lifts the cross slide off the bearing side of the nut and across the backlash distance.
This is the same problem as you have with a manual taper turning attachement. It can be overcome by starting at the other end of the work and cutting inwards. This means as a hard and fast rule, that you must always turn external tapers from large to small, and internal tapers from small to large (if you are working in the conventional tool positions). Its just kind of a nuisance that backlash causes.
First you get good, then you get fast. Then grouchiness sets in.
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)