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OK, I'm, sold! My shipment of  a few cylinder magnets (1/8" X 3/8")  from K&J Magnetics arrived and I literally just popped them in for a quick test.  Just as NITTANYLION has been telling us, they work just fine.  Why would we doubt? So, I just drilled six little holes with a 1/8" drill on either side of the rails (inside) as shown by the OP's diag. ....pushed the magnets in (not even a dab of glue yet) and tested with the cars.  Works just fine.  I will add a drop of glue to hold them down, although the size of the magnets seems just right.  Strong enough to always open the coupler, but not so strong they pop out of the roadbed onto the axles or anything, just being held at this time by friction in their little holes.  My road bed is ballasted. They are as good or better than the Kadee over the tie magnets that I had been forced to consider because of lack of forethought in laying track without putting uncouplers below.  And the cost is less ....$2.16 per site compared to $3.50 for a single Kadee.  I think I may use 8 per site just to be less fussy with my old eyes and positioning. But the best thing is that they can be so easily hidden by a little more ballast, unlike the Kadees that have to pass for asphalt level crossings or some such thing. Anyone like me who wants to start uncoupling but didn't consider it so seriously in the building stage.......try this.  Thanks to NITTANYLION again! (Of course it is compelling me to reset any carelessly set coupler pins and sloppy coupler installations in 260 cars and 125 locos.  I find about 10% need redoing......not too bad, and I am finally at the stage of layout building to consider this task a priority.  Gotta love the whisker couplers!  Need to order a few more of those too.)
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