Included in this .zip file are replacements for all the files located at:
<LabVIEW 2010>\resource\Framework\Providers\lVClassLibrary\NewAccessors
The VIs and libraries are identical to the ones that ship with LabVIEW except that all the passwords have been removed. You should open MemberVICreation.lvlib. If you look at that library, everything is laid out in what should be a reasonably easy to follow pattern. The two top level VIs are at the top of the library: CLSUIP_NewAccessorDialog.vi and CLSUIP_CreateOverride.vi.
You will notice a lot of utility VIs in here for doing various modifications to classes. Please feel free to create new children of "VIRetooler.lvclass" that is capable of scripting new VIs from existing VIs for new forms of retemplating, overriding, etc.