From a racing safety perspective, I like the additional cage.

For your stated priorities specifically, I would find an alternative solution. That particular solution looks like it would be very difficult for ingress and egress, and to the extent that your priority with this car is instructive training for passengers, that cage would be a total PITA.

We've been struggling with this broomstick test problem for awhile, and we solved it with a floor and seat solution. But as I was looking through some photos on my phone of the 818 early in its FFR development, I stumbled upon this one with some interesting roll hoop supplements above the main hoop. This photo is from before the track testing of the prototype car (I believe). I've been wondering about doing this too and if those would pass tech:

IMG_3371.JPG