Now I have a headache!
If the objective is membership required, then the event registration team should be checking against a region generated active members list during the pre-reg phase with one question to answer: Is this pre-reg from an active member? Yes=pre-reg accepted, No=pre-reg not accepted.
There is nothing to be gained by having the tech team look at membership cards since they have no idea who is pre-reg or not. And frankly it does not matter to the tech team in either case.
The logic that this is to help remind people of their membership status is flawed since it doesn't make a difference to your tech inspection result. It makes a difference if the driver is pre-reg or not, which the tech guy can't discern in either case.