An open ladder is not, inherently, something to be taken out of service. There are many such in continuing usage in other spheres. For example, how do you think a tower crane operator gets up to their cabin ? Or how does a windowcleaner manage to get insurance for his employee ?
Do you wear a safety helmet for the climb ? I would.
However the risks do need to be minimised if practical. Is there a plan for how to remove you from the room if you fall unconscious ? There certainly is for tower crane operators.