Emptying Venice is certainly not feasible; the action is too drastic, Ernst would not agree, nor would Austria-Hungary. What East Africa is doing is simply moving the jobs of Venetian workers who migrated to East Africa to East Africa as well.
In reality, a significant portion of Venetians who reached East Africa have participated in the great endeavor of pioneering, so the industrial needs of Nairobi are not large, but they do require professionalism.
At the same time, Ernst's initial goal was to make Venice Austrian territory, to avoid it becoming a potential landlocked country in the future, rather than to force the remaining Venetians to oppose Austria for autonomy and independence.