How about creating a brand new account level so every newly registered account will be redirected to a sub-board name: New Member introduction where there is a pin thread about forum rules and he will have to follow the right format in introducing himself and part of that format is asking if he read the forum rules once he posted his first post which is introducing himself the whole section will be opened up for him.
So new members are all aware of the forum rules.
Just my two cents of opinion, that you can ignore.