It may be possible if bitcoin becomes legalized in that country who has a lot of poor people and the transaction fees may be an hindrance for them
Well that is just the issue here, how can they even earn Bitcoin in the first place if that country is really that poor? Based on what you've mentioned, these poor people don't even have enough money to buy gadgets, or even worse don't have the knowledge to use one ('cause they're poor).
because if they want to buy coffee for only $2-5 they would have to $0.15 or 0.85 just to make the transaction faster and to buy coffee. They would have to convert their bitcoins first into their fiat currency to be able to buy goods and neccessities and would decrease of price in bitcoin depending on the volume of people converting it.
That is exactly we wanted to resolve here, what if instead of converting Bitcoin to any specific fiats depending on the country is to just accept Bitcoin as payment directly, thus no converting needed.
And also, the price of Bitcoin will not decrease due to converting it to fiat.
The only work around this problem is first thst coutry needs to legalize bitcoin and second resolved the bitcoin scaling issue.
Well, some of them have already legalized it. But how can we resolve the 'scaling issue' if we don't have the full control of Bitcoin (not that we can do such a thing, talk about decentralized cryptocurrencies).