In recent weeks I have had many requests to adapt the TT rider mount. I have even seen TT customer support saying the same to users ask RAM.
Its a very simple trick. if going onto a GS.. then use a normal mount eg RAM-B-149Z and the RAM diamond base attaches diagonally across the rear face of TT cradle (remove the TT arm and plate) with existing or in some cases longer M3 screws. The most recent mount on TT Rider was for Suzuki ??? and last week a Ducati 998.