To my knowledge the CPU is soldered to the mainboard, but I haven’t looked inside it for a while now. Mine is running an Intel Atom N455; single core, two threads.
I’ll probably swap to a BSD for it when support ends.
The problem is not software but hardware. The Compaq CQ510-SD is a nice compact design with round edges and small enough to fit in most any bag. Finding the same in a x64 system seems impossible. Hard edges, larger screens, flimsy chassis, or unuseable keyboards.
I did, yes. Finding a 12" or 13" mini-laptop is just tricky. Might need to build one of those custom clamshells.
I use a Compaq CQ510-SD for writing. Lovely small keyboard, only has a resolution of 1024x600, but with some zoom configured in autostart that increases to twice that. It works as little more than a glorified text processor, but it suits my needs just fine while I can’t find its equal in the x64 or ARM market.
I tend to write on it on the couch or at the library or wherever, and then use syncthing to sync with my desktop. This does require keeping syncthing updated.