Leadership Consultant and a Psychologist Wanting to Join MBB – 4 Month Plan?

I'm a 42 year-old psychologist and leadership consultant with 17+ years in Counselling, change management, digital transformation, and AI implementation. MSc Psychology and No MBA.

I want to join MBB (McKinsey/BCG/Bain) as a Senior Associate/Consultant lateral in the next 4- 6 months. My pivot is Leadership + Change Management + Digital Transformation + AI Fluency.

Questions:

1. How do I get on MBB's interview "closed list" without an MBA?

2. How should I position my psychology + AI + change background vs. MBA candidates?

3. For case prep: drills or full cases? What do lateral hires get wrong?

4. If MBB doesn't work, should I target Big Four digital (EY-Parthenon, Deloitte) as backup?

Willing to invest in coaching and networking. Need a clear roadmap.

Any advice from lateral hires (35+) or MBB consultants? Thanks!