I read a previous thread about training one's own dog to be a service dog. ...
First it would be helpful to know for certain what country you are in as you are getting information from at least two different countries in this thread -- the U.S. and Canada. Since you mentioned an organization from the U.S. I am going to assume you are also living in the U.S.
In the U.S. it is legal for someone to train their own Guide Dog just as it is legal to train their own Service Dog. You can train on your own or with a professional trainer to oversee your training.
Secondly, it would be helpful to know the degree of blindness that you are asking about. Lowsighted? Able to make out shapes but not features or read signs? Able to see in full lighted conditions but not in dim? There are so many variables.
Have you ever trained a working dog of any type? Do you access to people who can assist you?
Has anyone heard of a guide dog organization that will allow people to raise the puppy that will be their guide dog? Or that accepts pets owned by the blind person's family into their training program?
As to becoming a puppy raiser for a reputable organization that trains Guide Dogs with the final outcome that pup will then be trained for you, I don't see that happening. Even with fully trained Guide Dogs they are not assigned to their handler until final team training. At that time potential handlers are matched with a dog that has been picked for them based on handler's and dog's personalities, handler's lifestyle, and overall thoughts of the evaluators if dog and handler would make a good working team. Even then at times the first dog picked just doesn't click with the handler and a second dog must be tried.
On the issue of accepting pets .... again I don't see that happening. Different organizations use different breeds of dogs and most of the top facilities have their own breeding programs. Those that do not, have certain breeders that they go to.