When I investigated this, it became apparent that the display-side connector is not standardized much, so you need to be very careful to match every pin from the laptop to the right pin on the display side. In the absence of any data sheets either from Framework or third-party displays this can be done loosely by checking where the grounds are in that connector, and if they match one of the common pinouts, hoping that it’s that one. (See example here)
I also got an impression that laptop-side pinout is also not really very standardized and that shuffling the pins from the laptop to a display is a common practice. Meaning that getting a different eDP cable from the one you already have in the laptop might shuffle the pins in a wrong way.
In addition to that, display connectors can have two pin pitches - 0.4mm and 0.5mm. Framework uses 0.4mm on both sides, so if the display you want has 0.5mm pin pitch, you’d need some kind of adapter to connect it to the laptop. DisplayPort is a very high speed interface and its signal wires need to have a certain electrical characteristic (impedance, I think) throughout all the way between source and display. Laptop and display manufacturers can agree on that number before production, but you’d then need to match it, incl. the adapter.
Oh, and Framework’s display has electronics below the panel, so you’d have trouble fitting any display with electronics on its back into the laptop.
I am not an expert at all in those things, but this was enough for me to see that unless Framework works on a display option, it’d be really hard to come up with a viable display replacement myself.
And I didn’t mention that eDP can be 40-pin and 30-pin. That 40-pin eDP can be 2-lane or 4-lane. And that backlight power supply is also pretty much a thing specific for each display, so it might be that Framework has to update the BIOS to support each new display option by reading display’s EDID and then programming the backlight power supply for a particular panel.
PS. Again, I’m not an expert. I could be spouting 100% bullshit. Treat me as if you were reading an LLM’s output.