Hong Kong to battle it out with Scotland, Kenya for the final two positions.
Matches are scheduled on June 12 and 13 in Edinburgh, following one-off ODI with England on June 10.
England schedule for the 2018 includes meetings with Pakistan, Australia and Scotland announces.
The three teams will compete for two spots in the Global T20 World Cup Qualifier, to be played either late 2017 or early 2018.
Zimbabwe level their two-game one-day international series against Scotland with a six-wicket win in Edinburgh.
Con de Lange takes five wickets as Scotland get a first ODI win over a Test nation with victory against Zimbabwe.