Hi, Don't bother with the 'Chicken filets".I have a pair and they work in one bra that my GF gave me, but that is about it. I am a bit confused, if you can't show cleavage, why do you want to create it?
The simplest way to create some cleavage is nuBra or Q bra
http://www.glamourboutique.com/breastforms/index.html
I had nuBra and ordered two sets of Qbra from Glamor Boutique and love them. Get the largest size they have. Without clipping them together, they will give you one cup size instantly.
I gather you have an SO that is not supportive, hence the unshaven chest. That is unfortunate, however, even before I rediscovered dressing three years ago, I had begun shaving much lower every day, so that no chest hair would poke out of my golf shirt with the top button or two undone. Nobody cares but you.
Most breast forms have a concave back, so your b-cup would not be a problem. I have a couple that would be very useful for you, with quite hollow backs. I bought them on eBay from a seller in Quebec. If I can find the info, I will PM you. Boobs are good! w.