To implement what the OP has proposed would cost an absolute fortune in immediate and ongoing costs.
It will also reduce revenues by some degree for all those who fail, lose their licences and possibly their jobs.
Perhaps instead of such a drastic change, a simpler solution would be to include into the hazard perception test an additional area focusing upon the required distance and correct manner by which to pass a cyclist and what to look out for including wind against flags and other hazards that may cause a cyclist to swerve or change direction suddenly.
Also, to remind road users, a televised road safety campaign could also be produced. Like the ones they used to make for speed awareness and the look, look and look again campaigns.
In reality, the vast majority of motorists have no idea of the danger that they pose to a bicycle or slower moving vehicle whilst overtaking, anything from wind turbulence to actual colision.
I'm sure a video from inside the average car of an average man overtaking a cyclist too closely, or cutting back in too soon, or slowing immediately upon overtaking, all whilst perfectly happy and blissfully unaware to suddenly hear the blood churning consequences of the carnage caused behind him will change the majority of motorists actions when passing a cyclist.