I wonder how simple I could make a business card with a microcontroller on it that only had a serial UART with copper pads to solder wires to, or some kind of pins.
People will be paranoid about inserting a USB device into their PC, but maybe a business card thing clearly labeled like "I am a 96008N1 RS232 terminal" would encourage people to wire it up and take a look.
People in the small UAV industry absolutely would since serial uarts are incredibly common interfaces on small flight controllers, how they talk to radios for command/control and to motor ESCs.
People will be paranoid about inserting a USB device into their PC, but maybe a business card thing clearly labeled like "I am a 96008N1 RS232 terminal" would encourage people to wire it up and take a look.