Someone said the 24ohm version of the EB works.
I like the DVP - it works well with the Kemper.
I sold my G-Force a long time ago (when the G-System came out). I just remembered it was possible to use a Volume Pedal OR an Epression Pedal to control it. If your EB Jr. is a volume pedal (not an expression pedal), that explains why it does not work with a single TRS cable to control the Kemper.