Low tech solution for instantaneous payments, no computer needed.
You simply print out the private key that holds a certain amount of bitcoins.
Is anyone else seeing the irony between these two statements?
A computer would of course be required to print out anything...not to mention use the blockchain to transfer bitcoin to a prepaid card.
Any value in this?
No. But I have a better idea for you, have you heard about OpenDime? OpenDime is like a bearer bond for Bitcoin. It looks like a thumb drive, you load it with Bitcoin, and then you can pass it around as payment until an owner wants to redeem the Bitcoin contained within.