The government of a former colony which recently became a newly independent country decided to replace local dialects with a constructed language as the official language. The new language doesn't have any similarity with any local dialect nor with any other language in the world.
How should a country introduce a constructed language as the official language?
Story background
The government has chosen to use a constructed language as a part of the process of building national identity. They don't want to use a foreign language. They also don't want to use local dialects because they are quite similar with the languages of the neighboring countries.
The time setting is decolonization after 1945. Most of the citizens are illiterate. Those few that could read & write use the language of the former colonial masters.
Question
The government of a former colony, which recently gained its independence, decided to replace local dialects with a constructed language as the official language. The new language doesn't have any similarity with any local dialect nor with any other language in the world.
How should a country introduce a constructed language as the official language?