

Yeah, going along these lines. There is probably a USB header on the motherboard. These have pretty darn good speeds. You can get an adapter that lets you turn those into a USB-C port and then use a standard USB-C to Ethernet adapter. Something like this or this. No guarantee on either of those specific adapters being good though. Looks like slim pickings for such things and both of those are garbage brands.
If you have a USB-C port on the back of your motherboard, you can get an adapter for that directly.
Also, motherboards generally come with 2.5Gb/s ports now too. Some even have two. Something to consider.
Seconding Framework, they make great laptops.
Highly recommend getting one with an AMD processor, as AMD drivers are built into the Linux kernel updates. Driver updates will just work without you having to think about them.