Patience! People are taking part in the forum discussion in their free time and have usually other jobs to do.The silence is deafening
Thanks for visualizing your suggested eddy current pattern. Unfortunately I'm presently not able to verify or falsify one or the other idea (post #18 versus post #11) with a 3D field simulator. You can of course try to derive feasible field/current geometries with pencil and paper applying EM law. An important point is e.g. that field lines have to be closed. Presuming that field lines can't pass the conduit wall, the flux entering one conduit end has to leave the other end, with a constant flux integral along the way.
Regarding the idea of achieving a kind of "flux concentration" with conduits, I doubt that it's possible.