I have left the bark on my staves to save time up front the last two years I harvested osage. I had a bunch of splitting work, and I ended up with a bunch of staves; I was tired, and I don't need to remove bark to speed drying time or remove wasp larvae, as the Indiana Osage I cut has never had wasp larvae or they simply can't make it thru the WY winters...IDK. Anyhoo, removing the bark and sapwood on these cured staves has been nothing short of a royal PITA compared to when I removed the bark and sapwood straight after harvesting and splitting.
Do yourself a huge favor on many fronts and go ahead and remove the bark and sapwood after you split or saw those in half. You will likely only have 4 staves...6 max, and removing the bark and sapwood will
1. be much, much easier now rather than later
2. prevent accidental back checking from happening if, over time, pieces of the bark start separating from or get
knocked off of the stave. This can and does happen, and when it does, the sapwood will check and carry the
check deep into the back of the stave.
3. remove any possibility that one of the possible wasp larvae survives the pesticide and ruins your stave.
4. allow you to chase rings on the staves and reduce them to "roughed out" bow status. Despite sealing the ends
and back, roughing out will result in much quicker time to "cured." That said, with those sized staves, you
aren't going to gain much speed of drying because there is not much mass to remove, but with bigger staves,
it will make a huge difference.
You are going to have to do it eventually...so knock it out now.