I wouldn't split it, especially if you haven't gone done to your chosen ring yet. If I then decided to try I would use a bandsaw.
Yes you could split off the belly with tiny wedges, but you sound inexperienced and it is not really the place to learn with a good oasge stave.
Best case scenario you could end with 2 marginally thick staves that might need glued on handles, or you could end up with a couple of pieces of firewood. Practice belly splits on other wood first, get the process down and use it on future staves. As the saying goes "A bird in the hand is worth two in the bush". Though good luck if you end up deciding to split it.