I having read the manual again I see the charge pump controls the damaged output 1

Not all outputs as I thought last night !

which breakout board are you thinking of using ?

To add another charge pump you need to use a breakout board with a built in charge pump circuit or
something like cnc4pc's C4
https://www.cnc4pc.com/c4-safety-charge-pump.html
the detector circuit is hidden under the board !

You need the circuit that controls the relay to ignore static logic levels
and only detect the 10Khz charge pump signal

older version
https://www.cnc4pc.com/pub/media/pro...ser_manual.pdf
Click image for larger version. 

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John