Well now aren't you in a fix LOL , what you need to do is use AE's NTC3 clutch set-up ,it works with the SG shaft, very ajustable too.,only thing is you need to use the clutch bells from it as well, because of the larger diameter.
I too tried all the stuff your attemting about 15 years ago when the first GT'S came out ..... What a pain ,and I gave up, but since then there is a lot more to choose from.