I just want to add two things.
One is that the reason they do that in SIRC is to protect the lawyer as well. If I've read the secret file, I'm not going to want to go into a room by myself and then have an allegation a year later that I said something I wasn't going to. You need to have that protection there. To our way of thinking, the closest you can come is to have someone from SIRC available to be a witness as to what was said and to perhaps advise if a lawyer thinks a question might be inappropriate.