Ok, so that's already different from the original "Any supporter entering the park" proposal. Now somebody has to count them as well.
Just ask the folk who were having issues trying to buy tickets for the past couple of games how annoying the whole "check their buying history" thing went (and how many folk were still spotted in the wrong end despite the checks). And you'd want every team to do that for every game, even when the ground's only half full? If not, does the 10 person pitch invasion rule still apply to those ones? Etc.