Klipper does not require an extruder to be configured.
Here is a Klipper Github discussion where someone actually is running Klipper on a MPCNC
I got one of the Manta M8P + CB1 for the Repeat V2 not installed or built yet.
I also replaced a Raspberry Pi 4 that was running klipper for my CR10S- Pro with the Raspberry Pi adapter + CB1 and I will do the same for my original Repeat .
You can’t go wrong using it… especially for the price…around $50