Should have you covered.
I went the 12” MacBook route which can also install Linux.
would be interested to hear any expeiences among this crowd
Also works on AMD but did get crashes sometime and sometimes need to boot into Windows to reset audio….
Microsoft Surface with Fedora GNOME is a good easy gateway to Linux, mainly because of the touchscreen
https://github.com/linux-surface/linux-surface/wiki/Supporte...
The ROG Flow Z13 is another candidate but it's not clear how support is. With differing reports I can find online. Also way out of budget.
Personally I'm holding on to the faint hope of Asahi Linux getting far enough and a kind soul jailbreaking an IPad Pro.
Overall, I do agree that the hardware feels quite nice, and besides those issues I listed, the Linux experience is quite good. I was very happy to not be forced to use Windows.
There's no official, user-friendly way to install ChromiumOS yourself. A company called Neverware provides ISOs for x86 PC's but like you say the drivers are spotty and these releases lag behind ChromeOS. I'm not even sure what tablet devices are out there that you'd _want_ to install ChromiumOS on yourself? Maybe a Surface? These don't even have mainline Linux support (https://github.com/linux-surface/linux-surface exists though).
ChromeOS on a device like the Duet is a nice experience however, and still let's you get a Debian shell like I described.