Op has a good proposal here but it all depends on admins decision, no matter the argument here whether the sub-board should exist or not it just a one mans decision that counters them all. But it's best to have his proposal approved because the improvement will be very much appealing.

Additionally, I also suggest that Yoruba language under other languages should be included as a sub-board in Nigeria (naija) local board. Although there are over 6 countries that speaks youruba language but in the forum it's mostly or just Nigerians who participates in such language conversation.

This is just a mere suggestions it can be thought of too.