Local Board is a place for bad English speakers, it will help them to be informed and speak whatever is easy for other users to understand. However, because the increase in bitcoin users there is quite significant, it's a good idea for the forum admin to consider your idea.
I support your idea that it is time you have your own local board. Given that so many people there spoke English, would it not die or have little activity in the long run ?
The board won't won't be speaking English but it would be speaking pidgin English it's a form of English but a vulgar format for the not so sound in fluent English, and they communicate in that way, many Nigerians has a lot to contribute but shying away of how to put there post in, I think a local board can help them before they are ripe to go in to main/prominent boards.