day to day national lingua francas
One problem with that country is that it doesn't. The language spoken by the ruling class isn't spoken in the most populated part of the country where there are three unrelated languages plus French.
culturally dependent on a different non-African country and facilitate emigration?
When they emigrate it tends to be to Spain or France, some to America a few to the Emirates. If anything they're a country with inward migration from Burkino, Senegal, Mali and Ivory Coast rather than outward.
They're a long way from being dependant on anywhere however younger people have discovered things like breaking bad and games of thrones which are rebroadcast on satellite TV or online.
One part of the appeal of closer links with Britain is that we ask very little in return and don't try to force our culture or consumer goods on anyone. People can take or leave what they like.
They survived the onslaught of French attempts to culturally and linguistically dominate and are good at picking and choosing cultural input.
Most of the country has no electricity though and their society/societies are very strong and thriving. China is a greater threat however their culture is too alien.