i have made several version of this tool. For the newest one, i have taken a keyboard apart. put in an usb hub. There is just the regular USB cable that goes to the PC and connects the keyboard, the KeyWrite and an micro sd card reader. The KeyWrite reads the encrypted passwords from an SD card. The masterpassword to decypher all the passwords is hardcoded on the device. I use a Teensy 4.1 with a screen, buttons and rgb leds, everything is connected to a custom pcb. I even made a stand for it to connect the KeyWrite without a keyboard. and a video in action and here are some pictures of previous versions.