I ate his cheesecake.
I say let Hits Em Hard turn all that bowling alley maple.
By turning and turning, you get to know your taper setup, your blades, your router, your electricity, your dust collector and your WOODS.
If those bowling alley dowels turn out to be too ugly or crooked for shafts, cut some sections at 15"-18" long. Find the the ones with consistent grain orientation and heavier/denser. They might be good for cores. Cores don't have to be pretty. They have to be straight and hard . 30" long rejects might not be 14-18" long rejects. Often the run-outs can be chopped off , and re-center the best section for cores.
If all those boards yield zero shafts or cores, at the very least you got yourself a good experience turning wood. And if you really pay attention to the woods you turned, they will tell you where they moved and why.