US i-banking prospects for euro business school w/o undergrad?

So I will be attending a well-known, decent European b-school (think Cranfield, Cass, Warwick) this fall. I was admitted on the basis of my GMAT score, work experience, without having even taken any undergrad classes. I'm 22 years old and since high school have worked in b2b sales and done relatively well. Additionally, I've launched a few social entrepreneurship-type projects in low-income neighborhoods.

Will having no undergrad degree have a profound effect on landing a summer associate position at an ibank in the US after my first year? The reason I'm attending school in Europe is: a) I'd like to live there for ~2 years, and b) Most US b-schools require someone with my limited (~4-5 years) experience to have an undergrad degree.

My plan is to land a summer associate position at somewhere like DB or CS here (or in Europe) but end up working full-time in the US. Have you heard of anybody doing this? Does it sound plausible for someone with no finance experience or undergrad degree?

Thanks in advance.