Shunting and Tachos

Lonewolf Yorks:
On any given day there are a couple of tractors left in our yard. They generally get used for shunting trailers by anyone and everyone. Not all of whom have a digicard.

So said tractors will have a number of 30 second movements (its only a small yard) down as “driving without card”. Maybe half a dozen.

Am I expected to make everyone put a card in to move a trailer 100 yards or is there a bit of leeway on this? What’s the official position.

Are the people who do the shunting drivers, or warehouse, office, or yard staff? Do they do any driving under eu rules during that day/week?