It's the best way to propagate coding culture.
Step 1: Get buy in. Discuss with the team and agree that it's a good idea. Write it down so there's a paper trail. Link to it in important base files in comments as a reminder as to what the guidelines are.
Step 2: Code review. Make sure the right people are required on code reviews for those base files. As the issues are brought up and fixed it will become a cultural habit and self propagate.