Hi, I don't know if this helps but when I went to college, I already had 4 years experience of colouring in the salon, as I'd been trained up at 14 and set upon clients not long after (can you believe that?!?!)
Basically, I had experience and knowledge in everything, including all the theory, apart from cutting. The college I went to were great. I did SVQ2 with them, and it went at my pace. I worked in the salon and they came to me every 4weeks and I could do as many assessments as I wanted. My point is, could you not look for a college in your area like this? My boss at the time paid £100 a month for me to train like this, but it was invaluable. There were also a few people on my SVQ3 course who were mature students and they benefitting from this. I just felt like my individual needs were met, much like what you are saying you are looking for.
I understand you feel experienced but I've got a friend who is doing a phd in some sciencey thing (I can't even spell it let alone know what it is) but there is a lot about colouring even he doesn't understand! There is a load to take in so I would recommend level2 and 3 and perhaps some additional training (I don't knoe if you are working in a hair salon where you can pick up some experience?)
HTHS