I've not read through everything in depth just a quick scan. So theres deffo loads of courses you can do with just your nvq2 qualification. To tell you truth when I did my lvl 3 it was pretty pointless cause I knew how to do everything on it.
The only reason most people do nvq3 is because alot of places only take on lvl3, but you said you're self employed so you haven't got someone to impress with your cv.
If you phone up your nearest wella academy and request a course book they said a big book with lots of different courses, what is covered in the course, dates etc everything you need to know. I've done a fair few courses at wella academy and they're absolutely brilliant educators and recommend their courses to anyone beginner or advanced levels.
Hope this helps