Welcome aboard.
In my opinion, having breasts in a very male dominated business environment is not really a problem, as long as you don't make an exhibition of them.
If you go with NBE, growth will be slow and gradual and from my experience absolutely no one said / notice my B now probably C sized breasts! However, that didn't stop me from feeling very conscious that my breasts were growing, but realised it was all in my head - nobody else's!
I've been wearing soft crop top / sports bras under my shirts/tops and go to lots of business meetings, events some in the corporate world and still yet no one has ever said anything.
It's amazing that teh vast majority don't put male and breasts together so they don't see them, or just see it as body building / gynecomastia.
If you go down the BA route, then yes, there will be an immediate and noticeable difference, which may provoke a more noticeable response from others, especially if you go large!
Good luck with your journey.