As far as I know the summer intensive course is for people who have already learned Bulgarian. It is part of a Conference dedicated to Slavonic languages and is attended by people from many different countries more as an exchange of knowledge and ideas than for someone to learn Bulgarian from the start.
The VT university used to run (and I believe it still does) Bulgarian language course for foreign students. It is starting in October and is very intensive - as far as I remember it used to be 6 hours every day from Monday till Friday. The aim of the course is the foreign students to be able to attend the classes in Bulgarian from their second year or from their second term from February (I am not sure about that). I have met quite a few foreign students who have learned Bulgarian at this course and they spoke perfectly.
As for studies for teachers most of the majors at the university actually are for teachers in different subjects, mainly history, languages, art, preschool and first school classes teachers. I do not know if there is special studies for disability people but I think it would be best to speak with someone in person about helping with such a programme. There is the need in our society for sure, just make sure you speak with someone who can decide or propose to the dean's committee.
Hope this helps.