isnt the main reason for windows in bedrooms for exiting if theres a fire/etc.....

b

There's gotta be a second way out

Light and air, not just a place to jump. . .

I think the question is really do you need to call out or built out an area as a bedroom. and how do you market its potential.

Light and air is obvious, the escape capability isn't addressed by the Solatube (as well as ventilation)

combination solatube/slide? hmmm...

marketability for super heros: up
commute time: down

You might be able to work something where the main exit / entrance to each room is are directly into a sealed path of egress most likely with a positive pressure fan, similar to how elevator shafts and emergency exit stairs function for high-rises that don’t have operable windows for egress. It would be a long shot though and take a lot more fire rated enclosures and doors that it doesn’t sound like you have room for. I guess you still wouldn't have a redundant exit strategy either but perhaps if you could convince them that the one is total secure and fail proof it could work. But I’m no expert