Semi or lever - if kids aren’t capable of learning the manual of arms for a semi then they shouldn’t have a gun in their hand at all. This is carry over gun shop type advice that resulted in every woman walking out the door with a snub nosed 38. If you think that rifle is complicated have you watched the kids with video game controllers and smart phones ?
This is based on my experience with my daughter- i tried the bolt gun and she thought it was boring. We didn’t shoot for almost 2 years after that - then I stuck a M&P15-22 in her hands. It had that cool look and wasn’t boring - that was 4 years ago. She is now an accomplished competitive shooter with over 100 matches under her belt in the last 3 years
Edit - I realize I am the only one with this view, but I can respect everyone’s thoughts