I have heard of rescues and foster homes that take only FIV positive kitties. Maybe you could find one in your area and they could help Mr. Raggs. Then you wouldn't have to worry about others being infected or have him get sick because he is exposed to so much while he is outside. I'm sure there is a fountain of info on this subject from a lot of the members who deal with rescue groups. This sounds like the best alternative to me because he couldn't infect others and he could live a good life inside where his health could be easily monitered. I hope someone else has info on this and can be of help to you.
I hope you have a very long and happy life Mr. Raggs!! We will be praying for you!!