Mobile money. You don’t need internet to access a wallet. @8333.mobi has created a lightning wallet that uses sms menu. However Tanzania blocked it. 

Or cash. 

Solution I don’t want to do but can only see as viable to get them off zero. Hold their bitcoin for them, use an excel to keep record of amounts. Because also I would be selling bitcoin too. 

Or

Use @powa as the internet cafe and invest in some laptops. Teach them
To set up a web lighting wallet. 

I think the later as they keep custody of the bitcoin. But many are familiar with the top option. So improving POWA infrastructure could serve the community in a big way.