I'd imagine two or even four divers taking each kid in between them. I assume there's a line, so no one is navigating and the route is fully supplied with any additional air needed. People go on intro dives all the time where an instructor does everything. Obviously the element of the long and narrow passages makes things a lot more difficult but it's doable. You just take your time. This completely unknown new technology seems riskier to me... Full face dive masks take most of the "tricky" don't breath in through the nose out of the equation. I'm a sport diver.

That said, there's always some people who "lose it" during a dive course or even newly certified divers. Though I've yet to hear of anyone who decides to stop breathing air and opt for water, usually they bolt to the top, which isn't an option here. That risk can be mitigated by doing "pool" dives right where the kid are and perhaps short stays in the adjacent cave areas. Maybe some relaxing music can be played as well... Another possibility is adding some "rest stop" by creating air pockets along the way.