And now it is clear that what the TS wanted was an alternate-action circuit, not really a latching circuit. But not a hint of the power level, and that does matter. Push-on, Push-off is OK for some things, but I always prefer either an on-off switch or separate on and off buttons. Alternate action where one can't see the controlled thing can be rather unsafe. At one time the NEC stated " All switches shall have uniform on and off positions. That is why we no longer have those rotary light switches on the walls. Still on lamps, but not on walls. And I am not sure how 3-way switches fit with that rule.