I'm confused! You appear to want to carry two phones around with. (Most of the people I know who do that are drug dealers!).
If you can copy pictures from your Doro phone to your laptop, you can also copy them directly to any storage device (such as a memory card or USB stick) attached to it. You could then take that device to Boots (or preferably somewhere cheaper, such as Asda).
Unless I've misread your question, you seem to be doing things the hard way!