It may be easier to first get into the bank to do operations or something less analytical.
Most research or risk positions require the person to have a finance background. Otherwise, it will be very tedious just trying to learn the ropes.

Read up finance on your own or take a Masters in Finance. That seems to be the better way.
However, it is costly and time consuming. Otherwise, you can start off in a smaller bank and work your way up. Either way, it is going to take alot of time and effort. At the end of the day, you must ask yourself if this is what you really want. Money and prestige is not everything in the world, my friend.