Version 1.4 enables the ability to duplicate workflow items, such as DEMs.
I can't seem to find the required code within the 1.4 python API to: create a duplicate of a chunk DEM, rename it, and reference it.
For example:
buildDEM : DisabledInterpolation
?duplicate/renameDEM: DEM_RAW
exportDEM: DEM_RAW
buildDEM : EnabledInterpolation
?renameDEM: DEM_INTERP
exportDEM: DEM_INTERP
etc...