I went on Alibaba / Aliexpress and found the factory that makes the oled display 1". tested and works, cost is only like a dollar and change.

Attaching TFT displays to the onion , there are issues with SPI from what I remember. Nexon is one way to go but that is all screen driven over serial.
There are "ways" to do video over USB... kind of like webcam over USB just in the other direction :) Good luck though. Here is a reference:

https://hackaday.com/2013/01/07/adding-an-lcd-screen-terminal-for-tp-link-routers/