Take the help of the experts who have been into it and learn from them.
I think its diffucult for them to access bitcoin. They need a lot of things like having a cellphone or computer. I think they still need a lot of money on that. Aside from having a cellphone they also need to have an internet connection. If they have all these then they might have an access. Thats why its more covinient if we just give paper money to the beggars, its more helpful for them to buy food or whatever they want to buy.
It is somehow impossible for the beggars to access bitcoin for many reasons. First they need money for the phone and internet, secondly they need knowledge to use the phone, program and understand the process of bitcoin.
The facts that they are beggars, they beg on streets or anywhere to aid there daily needs.