I don't get that much dysphoric, only when it concerns to sex. I'm not really confident about using a strap-on, I've never used and I guess I'd be very uncomfortable to have to stop to put it on. (I confess: I don't know how to use it!)
About my chest, I don't care, I don't like them, I want to remove it, but it's there, I just don't keep staring at them!