Not Going to Work
Between Congress critters and the military way of operating this is not going to work. Drafting various people because of the technical skills to be useful requires thinking outside of the box of how to pay and use them. One issue is Basic Training, may are to old and sick to make it through, so that is out. Also, giving them the rank of private would be rather insulting given the responsibilities many have had.
The only way I can see this working is by either direct commission (not likely) or using expanded warrant officer grades with a direct warrant.