I went to an optician to have my Oakley Holbrooks(which is also made off O-matter) widened. They do it by heating it with hot air with specialized airguns. The optician told me that it took a long time to get the legs to bend and that they tended to bend back to the original shape. My Holbrooks ended up being only widened a little bit.
Bending will not be easy to do yourself, at least without heating the material. Good luck.