It depends upon what you are trying to achieve. Firstly, you initially talk about the 'deliberate approach' to the stall so, in the early stages (for argument's sake pre-stall warner), I would continue with the ailerons. At the later stages, the key bit is to keep the controls centralised and remain balanced (ball). As this is an exercise, if you have an unintentional roll at this point onwards, I would recover pre-stall. Conversely, if you are attempting to generate/demonstrate a wing drop then continue as suggested above.
In you last post you talk about the objective being to keep he wings level throughout the stall. Can I presume this means you stall the aircraft and are not seeking immediate recovery? Instinct tells me that, in general terms, pilots shouldn't be fiddling with any of the aircraft controls (aileron/rudder) during a stall unless they are trying to achieve something other than recovery. Under such circumstances, the actions are very dependent upon aircraft type.