I try to keep it simple when training other pilots . I just use KIAS when I am sat in the aircraft .
I am not trying to dumb it down too much just not trying to reduce workload and keep it simple .
At the end of the day the indicated airspeed is the easiest number to use . Most of the trainers I have flown the differences was usually less than the thickness of the airspeed indicator needle above 60 kias.
Although it is possible to land a Cessna 152 with no airspeed indicated , fun demo for other instructors , I have rarely demonstrated students that because once they are in ground effect the dials can be a distraction and at that point it is better to pay attention to flying the aircraft .
Time to Fly