The CoreTech OSD HTA wizard is a very useful front-end for SCCM OSD operations. Unfortunately, as delivered by CoreTech, it only works on 32-bit Windows PE. To fix that, on a computer, run the OSD wizard by using the StartHTA.vbs in the OSDHTA\HTA folder. While the wizard is running, go to your %TEMP% folder and locate a folder labeled as a GUID string. The unpacked OSD HTA files will be in there. Copy those out to a more permanent share location that you can build an SCCM standard package with (and then you can terminate the HTA wizard running in the background).
Create a new script (in my case, I call it Run.vbs) based on the code below. Adjust the username/password/share location for the share of the CoreTech OSDHTA\HTA\Config folder. Because this script contains a username and password, I use the VBScript encryption tools to encrypt it and only place the final Run.vbe script into the SCCM package source folder. Then, when building the Windows PE image, include a prestart command that runs Cscript //nologo Run.vbe and references this package source as the files to include in the image.