Any? https://wiki.postmarketos.org/wiki/Lenovo_IdeaPad_Flex_3_Chr... is dirt cheap and runs PMOS quite well. Actually Chromebooks in general are a good bet when combined with PMOS - or even not combined with PMOS, if you can work with a normal Linux VM on top of ChromeOS.

well obviously not a machine with 4GB of RAM running outdated CPU

You said "ANY arm processor". If you'd like to further constrain the exact requirements, that would be a useful clarification. (Although, I suspect that some Chromebook will still work)

It's to respond to the remark that people are simping for Apple while in fact, they're just after a good arm-based laptop.

Thinkpad x13s is an okay option, but Qualcomm is IMO more cursed than Apple

What do you mean?