Depends on which throwing weapons
The throwing axes and throwing hammers use 1h wpf
The Jarids, Throwing Spears, Darts, Javelins, and Throwing Lances use Polearm wpf.
And yes it would be possible, if you wanna try out builds without actually having to respec in game, see what they're like on the cRPG build calculator:
http://alpha-lider19.ru/MB/