Anoreth thinks this is a great idea. USAA will have guidelines for what an insured should have on his inventory, and they can start by doing ours! Then they can volunteer for their Scout leaders and some old folks at church, to build efficiency and generate some positive word-of-mouth. They can get character references; a priest, parish council head, and Sister should look good.
Eventually, they can advertise in the church bulletin and over the homeschool association email list, and among Scouts.
Sad to say, but it would also be profoundly informative to interview someone who has suffered a damaging loss, just to emphasize what is really important in the aftermath. Excerpts from that would make a poignant reminder to the target audience.
Don’t forget the possibility of having an annual fee for the service. Even if no information changes, there is a cost for maintaining the information. That could be coupled with a reminder to update new information.
An offshoot of this kind of service would be to provide backups for people with computer records. Another thing few folks do for themselves in a timely fashion.