ADR approval has little bearing on defects, unfortunately. my custom made angel eye lights were built from all ADR approved driving lights, and used all the original mounting holes of the stock lights. did regency pass them.. yes and no. one inspector said it was fine seeing ADR approved, another came over and made a fuss about being left/right adjustable. however the stock lights are only up and down adjustable (which my angel eyes are too), and i have never seen lights that can adjust left and right. of course this was a lame excuse coz they didnt want to be wrong.
however with my cf bonnet, and all other cf bits, never had an issue. even tho the bonnet may not be ADR approved, as long as it has some type of fibre glass skeleton structure, and lines up with the original bonnet hinges/release latch, its fine. so avoid bonnet pins. well thats the reply i got when asking a cop. however like stated above, legalities are subjective.
i have also heard of people passing regency with their non ADR approved cf bonnets. so yeah i reckon ur pretty safe. ur if gona get done, it will be for something else.
oh one other thing with vents. rearward facing is fine, forward facing is straight defect, unless its a factory bonnet like on WRX's.