they can get bitcoin in paper form like what you get when using Bitcoin ATM.
pieces of paper with public and private address after that they can import the private key to any wallet "just show the private key to any scanner" and get the money.
Important point
you must have some knowledge and internet access to use bitcoin.
Then how can they know and access bitcoin if they dont have the knowledge over the internet or access on it?
they are beggars and living on the streets, how can people give them bitcoin for their food once FIAT is no longer available? we should print a dollar worth of bitcoin over the ATM and give it to them?