e dey sound strange 
It is strange but we have to value what we have. If someone is receiving salary in cedi, it should be cedi cost average. But if we are from different countries, it will be in dollar cost average because we all use dollar as the dominant currency among us. Unlike while referring to what is local.NCA or DCA strategy, what does it matter, what we should concern ourselves with as regards this post by our OP, is to decide on which strategy between NCA or DCA we would prefer to use, that is when we are ready to start.
The goal is to invest into ones savings or holding wallet and do it effectively to get a good return and if one should choose DCA then they have to save up more Naira to be even.
What that matters is that we should value ourselves and what we have. DCA, NCA or the currency CA, they all means the same thing. The OP is talking about naira, it is NCA. I do not like it to use other currency when we supposed to us naira.The goal is to invest into ones savings or holding wallet and do it effectively to get a good return and if one should choose DCA then they have to save up more Naira to be even.