Hi Lupo. I am not sure about any contacts on the Zim side, it has been some years since I fished there, but to cross the border to Livingstone is very easy and you can do so for a day, or a half day. Angle Zambia offer very good half day or full day fishing excursions from that area. Their e-mail adress is anglezam@microlink.zm
Give them a shout and see what they suggest.