I was using a newer version of ANSYS than you so it may have worked better for me, you might have to do some more work.
I recommend you take a circle that generates the cylindrical surface adjacent to the orange face I showed above. Use a cylindrical surface with a length longer than the thickness of the ring so it sticks out both ends. Then use that cylindrical surface to slice all the bodies. That will make a large number of six-sided bodies that will mesh with Hex elements.
After that, we can address the special circumstances around the blind hole.
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