Buying or selling bitcoin via p2p can never be a problem in Nigeria because there will always be a way out. No matter that we know our government is having issues with exchanges in Nigeria, no mean say some exchanges no still dey do p2p trade.
I use bitget and bybit for my Naira p2p. If I want to sell bitcoin, I sell direct and get paid in Naira, amd if I want to sell USDT same. It is only Binance and Kucoin that have delisted Naira from their exchange. Don't be scared about the banks warning because they cannot know if your transaction was from crypto. Also use online banking apps.
It is still very safe to do p2p transactions through exchanges in Nigeria, although the government is having issues with Binance and they disabled their naira p2p, also a few other exchanges did the same thing but aside from these reputable crypto exchanges, there are other exchanges that still enables naira p2p like the ones that you mentioned in these thread. Cryptocurrency has come to stay in Nigeria, and the adoption is increasing everyday, our government is aware of this glaring fact and they are accepting it that placing restrictions on exchanges can not stop crypto business in the country, so let them go ahead and regulate it to get their taxes instead of being skeptical about it. Also there is p2p transactions between two parties but which doesn't require the interference of government or any third party but you have to do it with a trusted person or escrow.