Not easily as that is part of the issue in that the HKCU is loaded during the logon process but KiX is starting at the front of that as well. If the script is silent you could pause the script for say 30 seconds or a minute.

Then it would automatically take off and finish up when the rest of the current user process has completed or about completed. Be careful though of items like drive mappings that need to happen often more quickly. Might let that run first then pause the script.