Take a look at www.gravitech.us
They have a whole line of shields for Nano's.
Maybe adapt them to use with Promini?
At the same time, a promini is not much more than a surface mount breakout board.
I'd just as soon put the chip on a custom board with other needed components, get a set of PCBs from iteadstudio (or whomever) for $10 and then not have to deal with all the headers & stuff.