Great questions, and great job on your recent GMAT and CFA exams!
Regarding your work experience in sales -- there's absolutely nothing wrong with changing career paths. This is one of the mot common reasons people decide to go to business school. You've developed skills and abilities in your career thus far, and those will still be applicable in your desired future career path. What's important is to demonstrate this via your essays. This is where you can show what you've accomplished thus far, be it leadership experience, strong client skills, business problem solving, etc., and how you hope to apply that to a different industry.
I also wouldn't worry too much about your undergraduate CGPA. Given the number of years removed from that degree, your scores on the GMAT and your complete CFA charter show that you have the academic capacity to thrive in business school. Business schools are concerned with the total application package, not just one aspect, particularly one aspect that you've shown you've grown from.
As for your school choice, it's important to consider the specific programs and what you want to get out of them. European programs tend to be more internationally focused, which may be what you're interested in. A for working in the finance/banking sector, if this is something you want to do, there's no reason to not pursue it now, regardless of what you decide to do with your applications. It may help you gain experience and insight to take your sales experience into the financial sector, but at the same time, it may be more worthwhile to start a program and use that as your launching point.
You have strong enough credentials that I would focus on the specifics of what you've achieved professionally and how you can apply that to the b-school programs you seek. The more specific the better.
We'd be happy to discuss your profile more. Please contact Meli at Meli@mbahouse.com
and let us know what you think!