What I was planing was introducing a set of new playbooks per tier (probably 1-3 tiers to begin with).
1st tier would be down-to-earth characters - like characters in the beginning of a tv-series. Examples could include biker, hooker, private eye, truck driver etc.
2nd tier would be an additional playbook. Thus they would keep the 1st they began with. This second tier would be something more special along the lines of characters that are more accustomed to fighting the supernatural. They would not be improved 1st tier playbooks. What I'm thinking is that they would be something more special like sorcerer, hunter, scholar, attuned, tainted etc. This would allow the players to come up with "combos" with the playbooks (more possibilities for a broken path, but more possibilities for fun too). This could also be used as an entry point if the gaming group did not like to start with mundane characters.
3rd tier would be the top of the notch. The best of the best. Cult leader, action star, slayer, mob boss... Something along the lines of usual playbooks of AWhacks. This could also be used as an entry point if needed.
This way the players would have something to aim to. "Oh I want to be a cult leader! I wonder how my character will reach that state". And again if someone would be running just a oneshot he/she could be using any tier preferred.