Wow, tough question....you should never have elective surgery of any type because other people think you should, that's for starters. Only pursue this if it is important to you.
To be totally honest, in your case its impossible for me to tell you what the odds of success would be based on your criteria. I would anticipate that the odds of a successful flap transfer are high.....have no ideal whether the A-cup, etc. would be part of the mix. Natural tissue isn't placed beneath the pec, so I think we'd be ok there. Don't know if we can produce a result without a scar across as you would be having a replacement of lost skin from what I can tell re. your situation description. Easiest way to tell from here is either photo submission through Nurse Educator or a visit down for an exam.
Hope this helps,