I´m not sure. I didn´t find THE solution in your proposals. Mainly I mean the ideas/constructions with 3d-files I took a look at. The others I may not verify. My english is not so good, as you noticed meanwhile.
The main problem what you perhaps not noticed is that the cutting direction is not horihzontally or vertically in 90°.
I put the ring with the cutting directions as file here...
cu...Mala

P.S.: I extractecd now the profiles. If it it would be possible to aling the littler circles to their bigger neighbour circles it could work. But how?