If you decide to cut it, seal the ends with plenty of glue, shellac, or urethane. If you split it into staves and remove the bark and sapwood, seal the backs of the staves like you do the ends. Store it in a dry place.
Before you cut it, check your area and see if you could find some nearby to cut, like someone mentioned earlier. Why not do a search for "osage" on your local craigslist site. You might find someone selling osage for firewood. You might be able to tell them what you are wanting and ask them to call you if they find a suitable tree. Just an idea. You could always go to the closest rural area and ask some farmers. They typically don't care for osage. Good luck with what ever you decide.