I'd have one slight amendment to it.
I noticed that last time when we had witnesses who came in, some of them required either a medical assistant or a spouse to travel with them. Take a veteran with post-traumatic stress disorder, for example; their spouse is with them sometimes. You may want to leave a little leeway in there that if we invite two, one of them may require a medical assistant or a person of substance beside them in order to get them through the meeting.
So sometimes you may, with certain exceptions, allow a third person to travel. It doesn't happen often, but it does happen.