If you want to do more with the BBC micro:bit, getting those pins from the card-edge connector is going to be your first hurdle. Unlike many dev-boards, the micro:bit isn't breadboard friendly. That makes the 'bit durable and easy to manufacture but means you need a special connector.
This surface-mount edge connector is designed specifically for the micro:bit. It's very slim and fully SMT so its a breeze to automate. It also only has contacts on one side, just like the 'bit, so you save money by only paying for the contacts you're going to use.
This version is a Right-Angle style where the micro:bit will lay parallel to the PCB. We also have a Straight style where the micro:bit plugs-in perpendicular to the PCB.