Hi Søren,
No.
The front panel jack is - as it says - a high impedance instrument input. These are never balanced.
You will need a mono jack that is switching, that is, an integrated switch that opens when a jack is inserted.
Three wires gors to the jack. 1) to the jack tip switch, 2) from the jack tip, and 3) ground.
Look at the schematic and the overlay pdf for reference.
Jakob E.