pitcher. Just having the baseball come at a hitter from a totally different angle - it might work for a few batters, but if she can't get velo up to 80+ I don't see her being successful - it might turn into city league softball batting practice real quick.
Follow-up question - using a softball throwing motion how fast could a softball pitcher throw a baseball - maybe a little faster?
Anyway having women spend their life trying to be good enough to play in the MLB seems like encouraging people to play the lottery to get rich - a colossal waste of time and money on something that almost certainly would never happen and for what - to try and prove a point? In the meantime you're encouraging young women to throw away their lives in that pursuit. Plenty of supremely talented men do it already, play 10+ years in the minors and never sniff the majors