In most part of Africa hardware wallets are not only difficult but expensive to get apart form using custodian wallets like trust wallet and metamask is there an alternative software that can help hodl Bitcoin in a flash drive. or otherwise
you can use regular flash drive as storage why not? but how you encrypt the data there is up to you. And the second point that you did not take into account, make more than one copy of your private key or the information that you are going to store there, it is more likely that you will save what you need, otherwise, with the loss of the first flag, you lose absolutely everything, there should be more than one reserve .