Wilmingtech. While I am a HUGE proponent of short cranks, there are limits. While I ride with 140mm and shorter cranks(125mm at the moment) , there is no way that I would recommend that you ride 140mm cranks at your height.
You could experiment with 172.5mm cranks by all means but the results really could go either way.
The limiting factor with short cranks often ends up being the feeling that you can't really stretch your legs out far enough. This is the opposite of course from cranks that are too long which forces people to stretch their legs too far and introduces dead spots in the cycle at top dead centre.
No one is stopping you from trying the 172.5mm cranks, so at this point I think you should try them before further hypothesising about them. It really could go ether way.