Question for #asknostr

My son is too young for a cell phone but I do want him to have some sort of mobile ish hot wallet type solution. He used to be on wos but now we need a new solution. Are there any products out there that might allow for this sort of functionality? Perhaps a 1 of 2 multisig so I can safeguard his funds when he inevitably loses his device?

I currently have him set up on mutiny but that only works thru his laptop. Was think8ng some sort of nfc card type deal? Seedsigner? Satscard? Tapsigner? Not sure.