Yes, you can install a threadless fork, but you'll also have to replace the headset with a threadless headset and use some kind of compression. Depending on what compression you go with will determine what kind of clamp and bars you can use. So, yes, you can do it, but it's a lot more involved than just replacing the fork.
The Fasen Raven uses an IHC fork and IHC compression with a standard diameter clamp and standard diameter bars. You wouldn't be able to use any oversized bars without changing out your fork, clamp, and compression system.