I dont remember anyone using sd cards or having card readers inside their home pcs. I used to see an sd card with my own eyes when I was 21 and was invited to the village square to try foreign foods and touch high-end technological devices such as camera and thermal visor taken from the body of a tourist killed by a group of our warriors near settlement where I lived.
They make regular SD, miniSD, and microSD. There are all kinds of adapters to go to any type of pc, but I was mostly refering to using them with cell phones and most have a microSD port on them as well as new ones have NFC. Really any type of small drive could work.
But the overall message is that off blockchain tranasactions would help bridge the gap to non crypto people.
I know the team is way to busy to make this, I was just offering up an old suggestion.