Converting Symbaroum archetypes into FL classes and Symbaroum abilities into FL talents should be easy enough. The major missing piece would be the corruption mechanism. Perhaps use some sort of stress dice (Alien RPG) hack for Mystical abilities/talents?
Another really major missing piece would be the feel/flavor of the Symbaroum game. Like @Valyar said, the focus is very different between the games. FL is much crunchier than Symbaroum, where the rules almost become transparent at times. FL is great for hex crawling, Symbaroum isn't. That being said, I'm quite sure you can get Symbaroum to work with FL rules if you really want to.