Just get a Thinkpad. They have all the features you want. They're not going to be as thing and light, but their keyboards are better than anything out there. The touchpad is iffy, but if you're using Linux (I use it too), your touchpad experience is going to be subpar anyway.
I have an X1 Yoga which is capable of all of these things. It is a laptop with a good keyboard setup that can hold up it's own screen w/out a kickstand. When I don't want the keyboard I just fold it up and the keyboard changes to lift and lock so the back of it is solid making it easier to put on a stand (or A frame it and use a couple of books in a pinch. They sell one with linux preinstalled too.
This is especially a problem on the older models. Some Thinkpads are really excellent machines besides their unfortunate 720p, TN panels.
Admittedly though, Lenovo seemed to get their act together on later laptops. My T460s has a matte 1080p display with 90%+ DCI P3 coverage, which is pretty good for a $300 used laptop.
I ordered a 1080p screen and controller from Aliexpress for my trusty old Lenovo T420. Installed in about 30 minutes and worked perfectly. The difference in image quality versus the original crap panel is huge.
