Should I go with the a833 conversion?

With a little bit luck, and when the Pedal is mounted the same way, you don´t need to change the whole assembly.
Just change the old brake pedal and build in the new brake and clutch pedal. Its pretty easy to ´change that.
Maybe its a littlebit fuzzy to do that in the car , but works well.

The clutch pedal just goes through the Brakepedal.