I developed this DIAdem application to make it easy to synchronize channels between two channel groups. You may manually specify the synchronization point on one channel from each channel using Flags in the View panel, or the application will accept a synchronization channel and automatically calculate the X offset. Hope this helps someone.
Inspired by these forum posts and my own project needs:
https://forums.ni.com/t5/DIAdem/Time-Aligning-Two-Datasets/td-p/3985396?profile.language=en
https://forums.ni.com/t5/DIAdem/synchronize-signals/m-p/1729428?profile.language=en
The fully functional Beta version can be found here:
http://www.savvydiademsolutions.com/apps.php?topic=apps-synchronize-channels