I've been down this road over the past two seasons teaching my youngsters, backwards. Couple of things I noticed. Race boots or general set ups with a lot of ramp angle are BAD for skiing switch. Your calves will get tired quick and be sore from working your skis backwards. Also, like mentioned, it is a difficult task to balance watching and coaching the kid while also keeping an eye behind you to be sure you don't hit anyone or anything. If the place is crowded you're better off actually skiing behind the little kid to block so nobody else blasts them from behind. If you're skiing switch in front of them watching you are helpless to stop an out of control rider from crashing in to them and you're also not paying enough attention to where you're going if the run is crowded.
The main thing that I did backwards was holding their tips and guiding them to get the feel of plowing, but that is done in a full reverse plow myself. Tip, wear a tight fitting jacket. If you have a baggy one it will droop down too far and block the view you have between your legs so you can't see where you are going.. And, leave the poles at the base during this early stage.
Once they started to handle the skis themselves I'd ski switch and watch for a few minutes, 180 back regular to be sure the trail was clear, and when it was go back switch to watch and coach them along more, rinse and repeat..
Good luck and have fun. It's really a blast when they start to get it and can ski even a green mostly on their own