Does Softpop2 have any sequencer output?
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If gate and CV, you’d need some additional circuitry and solder it inside your Gills to make it read CV inputs.
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If not it might be possible to pick up Softpop’s audio and convert it to pitch/MIDI, and use an envelope follower to emulate a gate, see @ktttttt’s pitch to MIDI patch: Mother's helper - for Gills or ask him about an other patches he has made!
Edit: I had a quick look at the Softpop 2 manual, and it says (p. 38):
For CV, -3V to +3V, you’d need to know what you’re doing to convert it to 0 - 3.3V in order not to damage your Ksoloti’s analog input pins.
Same with the 0 to 5V gates, though many pins on Ksoloti are 5V-tolerant so you could hook up the gate (and slide for that matter) directly to a GPIO on Ksoloti.