Look up the brand Intelbras they have a few residential intercoms that might work for you, I don’t know where you are , but i know they exist the US and some parts of Europe and they might be cheaper there since they’re a brazillian company (they’re the best one we have I think?)
I have their regular câmeras and they fit all our criteria. Ours are online, buy ots by choice it’s not a system requirement. At least a few years back a few of those intercoms with screens were compatible with the nvrs i believe.
Well, is not super common for sure, but Dell sure sell the same laptops with Ubuntu pre installed, they’re a bit cheaper too. At least in here South america they do, pretty much every single computer they sell has a Linux option from the box.
But I also can’t think of any other big brands that also do that, so you have a point, Asus and Acer have some models, but they’re harder to find, even online.