I tried this initially, putting my daughter in a 4 day "camp". It was one hour each day and she didn't care for it much. My daughter needs a little prodding at times and the instructors (mostly teens) don't do that (probably a good thing) so she spent half the time just playing around with some toys and "props" they had lying around. She got much more out of it with me and I also know how far I can nudge her to do things. She never would have rode the chairlift had I not scooped her up on put her on it. After the "trauma" of that first ride, she couldn't wait to do it again.
OK, here's the ex-kid's coaches take:
Leashes and tip locks work. I prefer just the tip lock. I used my pole underneath the lock to pull my kids around, then skied backwards in front of them to control descent when they got to a slope. Soon they learned to turn just from me moving my pole back and forth as they skied down behind me (me still skiing backwards). One day, the pole was removed in flight and that was it. On their own. But I do tell most folks to use the leash too.
Kids want to be with their Mom or Dad or both. That's true from the age of 3-8 or 9 for some kids. Kids do not want to be dropped off at ski school, stay there all day, and get picked up at 3:30pm. Kids will go to ski school and they will like it if Mom or Dad or both spend time skiing with them too. As an instructor and coach, I told my kids' parents that part of the learning process was them spending time with their kids reinforcing what was learned in class. Yeah, like homework in school. Some parents did not ski so I would take time on some afternoons to ski alone with 2 or 3 kids from the class.
If it's all regimented, kids will not like it. It has to be fun.