HiDepends on the cable routing system. Some bikes use snazzy shaped spacers to run the cables through, but the actual steerer is the same as many other bikes underneath. The Giant Defy is like this on some model years. So, it might be possible you can swap to an alternative system but the cable routing is not pretty. Can you post up photos and the bike make, model and year?
i am digging' that fsa stemI didn't like the integrated bar that came with my basso so i removed it and replaced it with my favourite easton one. I just bought an acros top cap with holes in and rubber grommets to channel the cables into the head tube. Cost about £12 and works a treat.
I bloody hate internal cables, but i do love this bike.