[Dave Moll]

Your first diagram appears to have only one bell coil in circuit, but moving your green (conventionally white) wire from 6 to 7, 8 or 1, I agree should work (i.e. using the capacitor in the bellset rather than that in the master socket). As Russell has intimated, it seems that my confusion has stemmed from the wire colours shown in the N-diagram appearing to equate to red for A leg and white for B leg, so swapping these while still using the master socket capacitor should also work.

Unfortunately, my experiments have gone on hold at present as both cables involved have developed o/c wires, so I need to source some replacements (preferably with conventional colouring to be less confusing) before continuing.