I'm sure it's possible, but if your watch is still under warranty I HIGHLY discourage you from doing this. You are creating a "frankenwatch" by putting hands on the watch that aren't the ones it came with from the factory, so Omega will not be willing to do this for you. Further, if you let your own watchmaker do it, you will void any remaining warranty you have left on the watch, since only authorized Omega service centers can open your watch while it is still under warranty.
If the watch is no longer under warranty, this doesn't become a concern. However, if you ever need to send the watch back to Omega for routine servicing, you'll need to put the original hands back on, since Omega will not service "frankenwatches". If you have all of your servicing done by an independent watchmaker, then you won't have a problem.
Just some food for thought.
-John