I'm not familiar with the 650 or 750 other than they use touch screen technology similar to that used in the G-5000. In the G-5000 there is a touch suspend button in one of the two primary menus.
I don't know about using the OBS mode in a G-1000. Seems that would make the active waypoint like a VOR and, thus, removing the course reversal holding pattern.
There is no substitute for training.
