I am in the same position, lots of experience but a lack of qualification has been hindering me. I have had dozens of interviews and in a lot of them it has been brought up about my lack of third level qualification.
My advice regarding Fas would be to research courses on their website before you go in, make a note of the name and number of a course you are interested in and ask to be referred to that. (if you have a printer I would recommend you print off the details as I was once told in Fas that a course didn't exist even though they were advertising it in their office)
Keep in mind that it is of no consequence to the fas advisor what course they get you on as long as they can tick a box to say they did. I too was threatened with having my JSB stopped if I didn't accept a course, though I am not sure how often this happens.
I was put on a course that has no interest and relevance to me, it's very very boring but am sticking with it, purely because it looks better to say you are trying. Another course I did was an area I had loads of experience in so was actually fairly useless in terms of learning ( I knew way more than the instructor) but again did it to just show I had the qualification. There were a few people on that course who simply couldn't grasp it, (an older man who had never used a computer was put on an advanced computer based course!) and subsequently failed the exam.
I had a jobbridge interview last week and was offered a postion yesterday. At my interview the issue of experience v qualification was brought up but I was able to show that I was at least trying to upskill and enhance, which did seem to impress them.
All I can say to you is go in there with a good idea of what you want to get out of it, make it work to your benefit rather than being another "success" for Fas.
Good Luck!