If you can't get some, don't worry about it. Just use the finest sandpaper you can get and finish with 0000 steel wool to really smooth things out. I used to do this with those wood handle sodbusters from Kissing Krane. It made a 100% difference in how they looked, for the better. Olive wood has such a nice dramatic grain, it just begs for a soft rag and some kind of furniture oil formulated for wood, to polish it with. I don't know about olive oil, if it would get rancid after a while.
You could always try a little bit on it. Worst that can happen is it smell like a salid for a while.