Hi Found in the War Diary Of 23rd Armoured Brigade Signals Squadron in Athens in November 1944. (WO 170-582) The Brigade had just received a warning to expect civil disobedience and rioting. Civil war kicked off just 2 weeks later. Sadly nothing in the diaries about whether it worked or whether it was implemented.
The use of electric shock against civilians was a somewhat grey area under the Geneva Convention and still is as there is some controversy about the legality of tasers and electric land mines
I would think that on reflection the proposal was considered to be dangerous and would have resulted in putting any bystander at risk of death...heart arrest from the earth fault current promoted by contact with 600 volts to earth via the human frame.
The complexity of 'policing' 'liberated' territories in the absence of a functioning government was complicated by the soldiers concerned were not there for that role. Technically the Geneva Conventions don't apply to policing - hence lachrymatory (CS/CN) gasses are available for use against civilians however not military enemies. Clearly the locals didn't see 'liberators'. Electric shock has long been considered for crowd control. I once had access to a 1970s catalogue of 'Internal Security' kit produced or marketed by British companies. It was a jaw dropper (it included shackles, thumbscrews and such). One system combined a water cannon with an electric charge...