This is my "too small" frame/bike. A 90s GT Course. The trick here is that while the frame is basically a 54, the seat tube is a massive 60cm. With like 2 inches extra height from top tube center. So while the seat sticks up, there is technically a small amount of post showing. I've similarly used a long stem that has a large clamping area which pops the bars up a bit without looking jacked up. It's technically a slammed stem, but virtually changes the headtube from ~140 to ~160.