Shunting and Tachos

A slightly different situation. A vehicle comes in the yard, the driver normally puts his tacho on break and disappears off to the canteen. A trailer needs to be moved but we cannot ask the driver who has just returned to do it. A warehouseman/ manager/fitter etc (ie not employed as a driver) is asked to use this the only vehicle in the yard to carry out the shunting. Let’s assume that this could be a regular occurence. So how do we proceed?

Ask drivers to put their card in slot two when they take a break in the yard? Ask drivers to remove their card if on break in the yard and make manual entries? the shunter changes the card over to slot two and puts it on break then does/doesn’t selects out of scope? or what?

We have ruled out1) Driver refuses to hand over keys. 2) the shunting has to wait 3) shunting without a record to prove that the driver remained on uninterrupted break.