Williams and Zhuwao were not named in the initial 15-player squad, but have been included in place of Ryan Burl and Tarisai Musakanda following the tour of Sharjah where Zimbabwe lost the five-match series against Afghanistan by 4-1.
Zhuwao, who is a 33-year-old left-handed opener, played in his only ODI a decade ago, when he featured against Ireland in Nairobi in October 2008, scoring 16 off 20 balls with three fours.
Zimbabwe is in Group B along with Afghanistan, Nepal, Scotland and Hong Kong, and will open their campaign against Nepal at the Queens Sports Club on March 4.
The teams can make changes to their squads without needing an ICC approval until February 25. All player replacement requests from February 25 onwards will require the approval of the Event Technical Committee.
ZIMBABWE: Graeme Cremer (captain), Tendai Chatara, Tendai Chisoro, Craig Ervine, Kyle Jarvis, Hamilton Masakadza, Solomon Mire, Peter Moor, Blessing Muzarabani, Sikandar Raza, Brendan Taylor, Brian Vitori, Malcolm Waller, Sean Williams and Cephas Zhuwao. . Heath Streak (coach)