I replied on another forum a bit ago.
I have used the CZC threaded barrel, which is about 0.7" longer than std TS barrel, on the standard bushing. It fits the TS, as well as SP01 without issues. The SP01 is about 1.2 to 1.4" difference, I am not sure exactly, but it functions just fine.
Cant be sure about the 1.4" longer version on the TS.
Based on what you have added about reducing dia and adding a clamp on bushing, my above reply might be of even less use, I guess.