In all honesty mate the amount you lose on a change over will likely be less than the total cost of replacing the box etc, 6k on a ba that still requires a new engine for your long term goal and 10 year old suspension and you see where im going here. I had your exact problem my t5 clutch went and I agonized over what to do, I ended up putting an exedy HD for 1100 fitted, that was 12 months ago and its still going good, but I don't boot it too hard these days, I had dreams of big numbers when I first got this thing but realised quickly that the ease of just starting with a manual BFII is the best path.