Back in the early '90s I fitted a Canjar SST to one of my Borchardts and retained the safety slide. No alteration to the rifle was required, only parts substitution. SUPER ugly and as mentioned before, required careful and very snug hand-fitting of the top knob of the trigger lever in the sear slide opening. And did I mention that it was SUPER ugly? Worked OK though. Later sold the SST portion separately and returned the rifle to the non-set version.

I bought my SST parts (trigger lever and kicker/shoe assembly) directly from Canjar, they don't make triggers any longer but they may still have parts or can tell you who to call.
Regards, Joe

You can lead a man to logic but you can't make him think. NRA Life since 1976. God bless America!