First one to use a 30-pin I think. But not first for an alternative screen - someone used an Acer Spin 713 OLED here: Framework Laptop Alternative Screens - #30 by crazyideasinc
Not sure if they ever managed to get the touchscreen detached however.
Edit: Actually missed that they seemed to be mistaken - that spin 713 screen is the exact same screen but with a touch overlay… not OLED.
Sooo… maybe I am also the first third party screen. Although any BOE 40-pin (assuming the same pin layout, and BOE screens seem to reflect the VESA standard) should connect up directly I guess.