I have so far been unsuccessful in convincing my wife's father (a Cuban refugee) that Bitcoin is worth looking in to. But this cashu wallet might be a nice way of onboarding him (although, I'll have to figure out how to get him to agree to use a smartphone first...)

📱 About ElCaju📱 About ElCaju

ElCaju is a Cashu wallet (ecash on Bitcoin) with Cuban identity, brother of LaChispa (Lightning). Designed to offer privacy, offline transactions, and a warm tropical experience.

I hadn't heard of LaChispa before, but it seems to be an LNBits lightning app.