I've read that the st10 doesnt like OBD much, but If I wanted to do small mods and flash through OBD for quick testing on the road, is it actually possible with the c167 or is it risky even with a genuine kess v2?
Both KR and KG ecus are based on st10F27x with all its features and behavior when writing over OBD.
So there is no guarantee that something will go wrong while recording in the field.
If you want to make spare ecu for testing you need boot mode tool to make a clone.