We have the almost the same issue. I said "almost" because it is not about whether to extend or retract the forks with a cage on it. Rather it is the issue of whether we are allowed to allow the lifting of a personnel on the forks in the first place, even with a cage.
This is after a couple of incidences of people falling off the forks and even from the cage.
So, we have build a platform for our warehouse staff to use to reach the higher points of the cargo being built-up. The platform can be forked by a forklift to move from place to place, but must sit on the floor when in use.