Hi Will, 
 
> Hi Michael, I guess this is rhetorical (until I try it for myself), 
> but couldn't I use the hi-poly export from MoI into ZBrush 
> generate the normal/displacement maps and then using a 
> seperate, clean MoI ngon export use that as the low poly 
> base object and just load up the paint & displace maps? 
 
I don't really know enough about the specifics to give you a good answer on this one. 
 
It all depends on how dependent those mechanisms happen to be on working on sub-d levels rather than dealing with geometry directly. 
 
From PaQ's reply it sounds like you would be ok to generate a normal map with this kind of method, but maybe the workflow of how displacement maps are set up to be used are more integrated into relying on the sub-d refinement process and so would not work for this. 
 
  - Michael 
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