In the UK at least, if you use a card with chip and pin then chargebacks are not a problem. As the PIN is sufficient to show that you identified the card holder. And even if it was disputed you could show from the blockchain that the bitcoin was delivered to the address.

I don't think I'd need to shoehorn a client into the PDQ. It would just be like purchasing tickets at a box office.

 - State your bitcoin address, or swipe your card with it on!? on adjacent computer terminal
 - enter the amount of GBP you'd like to convert to bitcoinin in terminal.
 - Hit purchase on terminal
 - Pay by Chip annd PIN card with PDQ.
 - collect receipt
 - Go spend your Bitcoin in local shops and services.

Seems like a good way of getting Bitcoin into the hands of real people in a real business community.

I have an office here so it's the sort of thing I could set-up either here or in the local library (also in the centre of town).

Then promote it as a local currency.