Career Change - Film to IB - Solve the problem

Quick background. 26 years old, Norwegian, based in London I have a bachelor of arts in film and Tv graduated with a first class, i have worked as a producer for almost 3 years in London and i’m not enjoying it. I had a lot of international exposure, and did enjoy managing my department and the deal flow. Either way, quit my job to look for something more interesting. Before uni I did one year in the military and I have a course in Business Administration (one year and decent grades) I have been renovating and flipping flats for the last 6 years.

I am really keen to get into Investment Banking, but I can’t assess the best way. I am interested in film financing, but this limits to where I could work, and i would love to have the possibility of working in both Geneva and Norway.

Here are the choices I have found:

Shortest:
Full time 1-1.5 year MBA at LBS, CASS, or Imperial. Focus the entire year on building skills towards Finance and Investment, join clubs choosing the electives geared towards IB. Intern and hope for a job.
(I asked Imperial staff and it took 4 people to say it might be possible)

Longest:
Start over finish my Business Admin undergrad and major in Finance, 2 years. Intern/MSc Finance or Investment/Wealth Management.

What kind of roles would i be eligible for? Could i break into IB in the big firms with my background? Anybody know anyone who has done something similar? I saw a few courses at LSE that had MSc in Finance or Finance and PE. Would one of those help me to do a career change?

Appreciate all answers!