Hmm.., could you state/explain how the ASUS Chromebook is tangibly more ergonomic than other laptop keyboards beyond what they advertise on their website?
While modern ThinkPads can't boast about their keyboards to the extent that their predecessors did, it's undeniably one of the better options. As such, consider taking a look at this page and see if you find something you fancy. I'm aware that the page hasn't been updated since last year. But, your budget dictates that it's in your best interest to buy a used device anyways.
FWIW, the thing with killswitch it not due to Bazzite, nor KDE. There's a f*ck load of user reports all over the internet with different systems that have experienced the same thing; e.g. this one by a GNOME user on Pop!_OS. As for your criticism on kdewallet, I was also bothered by it the last few times I engaged with KDE Plasma. I suppose I was doing something wrong. Regardless, it was an unpleasant experience.