I see bows in there.
I would do this. Find a 2" wide strip between the knots. Save the other pieces for riser wood. Then draw a line along the grain so that your next cut maximizes the length of the grain. Saw a diagonal line down the board 3/8" from each end in rough parallel to the grain line you marked.
You will have two pyramidal limbs. The fat end will be crooked. Flip them however you need to get the best side to the belly and back all things considered. If there are little cracks that I know will saw out they can be on the belly otherwise I put that stuff along the back.
Use a string or a long straight line to align the tips and the center closely then mark and trim the but ends to make them straight.
"V" or "z" splices can be laid out to your preference and glued up. Check alignment of the three points above when clamping.
When dry sand the back and joint and fill any small cracks.
From here I make a reflex deflex with a bamboo backing. Need instructions for that part?
So, those Osage boards that three rivers sells As splice-able billets. I get two bows out of the pair.