I believe the wifi module is a soldered down part in "M.2 LGA Type 1216" form-factor. It's probably possible to replace it with any compatible m.2 1216 modules from other vendors (e.g. Intel part number AX200D2WL wifi6 or AX210D2W wifi 6e - both have good Linux support), but since it's a soldered-down part replacement is not for the inexperienced or faint of heart. The other solution is to try and use an m.2 "m key" to m.2 a/e key adapter in a spare SSD slot, and try and get the wifi antenna cables to reach (by either extending the antenna cables or using an m.2 slot extension), and also the case to close. m.2 m key doesn't have USB, so you probably won't get bluetooth that way. No easy answers unfortunately.

In this situation I would recommend selling the assembly as a spare part to others. If you don't want to do that, then it would be possible to construct an adapter from the standard 40 pin eDP connector to the non-standard connector that Compal (the OEM for the XPS 9550) have used in the design. As @adamboutcher has already said, the connector carries 4 lanes of eDP signals, and also USB for the webcam. A (more ambitious) alternative would be to create an adapter from the non-standard Compal/Dell connector to straight from the Dell connector to USB + DisplayPort. The pinout and part number for the Dell connector is available in the schematic for the XPS 9750 (which leaked).

This may be useful - it shows along-side two different versions of the back cover of the G5 (H850). I noticed the differences whilst troubleshooting GPS problems. Swapping the backs between two phones fixed the issue in this case. There look to have been some design changes during production for these phones. You seem to be able to buy new OEM backs on a popular online auction site, but I ended up getting a reliable fix by buying a used one for a little under £4 (approx USD $5). This photo (click to enlarge - otherwise it’s difficult to see the detail I’m talking about) shows the phone screen and motherboard at the top, the replacement (working GPS) back next to it (centre of the photo), and finally the original (non-working-GPS) back at the bottom (sitting on top of and partly covering the working one). The design differences in the working back (centre of photo) are: (1) The square gauze to the left has been moved to the right of the photo, and sits partly directly on the aluminium phone back, and partly...