Kill switch deactivates servo output, not just motors

Hi all,
This is a helicopter configuration with PWM commanded servos and a single electric motor.

For safety reasons, it would be necessary to retain cyclic and collective control when the kill-switch is activated. The problem I have is that, as soon as the kill-switch is activated, the servos act as if the aircraft was disarmed and the swashplate goes flat and down and stops responding to any input. COM_KILL_DISARM does not seem to affect this at all, just the disarm status in QGroundControl.

Is there any parameter that can be modified to fix this?

Hardware: Pixhawk Cube Orange.
Software Version: 1.15.4