The brew (boiler) stat is placed to be where it is practical and effective, as is the safety stat. Positions are not equally interchangeable. Place a "brew stat" RTD equivalent where the OEM brew stat was, and that sounds like you will need the clamp on stat.
If you could have simply switched positions, then Auber would have also figured that and sold the screw stat with those instructions :)
The "less precise" flat stat is way better than the bimetallic that it replaces and probably better than a k thermocouple clamped there. Many used the K thermocouple before the RTD was available and it served well. The K thermocouple clamped is place is still adequate, and used in some DIY builds.
I don't think that the PID affects the use of a safety stat. Perhaps that is different on Silvia, but If something happened to the PID or SSR, still nice to have the safety stat to shut it all down. PID replaces the boiler stat and if you use PID steam, then it controls steam temperature. Safety stat can/should stay, I believe.
You replace only the boiler stat and then just use the PID to set temperature(s) at which it works.
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