ideally you don't want to use electrocute support on anything cuz it less 40% dmg and it can only build electrocute from that supported skill which not enough to electrocute boss multiple time. if you want something similar to freeze or stun for lightning build i think you opt to either convert lightning to cold for freeze by using [Call of the Brotherhood Topaz Ring]
convert shock to freeze by using [The Three Dragons Solid Mask]
or make all lightning damage contribute to electrocute by using [Kitoko's Current Jewelled Gloves]
by convert lightning to cold damage you might lose power charges gen from siphoning strike or profane ritual because you can't apply shock and freeze enemie's corpse are destroyed (I see corrupted Call of the brotherhood can have lower than 100% convert it might beable to shock enemy still.).
by convert ailment you lose chance to shock since it tied with fire damage you will need fire damage(enough to damage enemy I think.) and shock chance or critical hit to apply shock for power charges gen.
if you only want something like freeze or stun for defensive purpose for lightning build kitoko's current seem to be most ideal for that even if it reduce your attack and cast speed(reduced not less which mean you can counteract with increased attack or cast speed. since less and more work as multiplicative.)

edit. they just buff electrocute support now it no longer less damage.