This is just my two cents on how it would be done - with any saber and any coupler right now, simply with the addition of an extra piece. All that would be needed is a pommel that is threaded female at its base. This doubly-threaded pommel could be screwed into one saber, the coupler into the other, then the coupler into the special pommel. The coupler could then be unscrewed from the pommel mid-combat without the electronics falling out. Simple as that.
The other guys sell a 0.75" MHS extension that would do just that - basically acts as a vented pommel with female threads.
The problem with this idea is the exposed threads. One wrong tumble or hit on either the male or female end dents the aluminum, ruining the threads. The idea works - you'd just need to be extremely careful.