Is it possible to replace a single kernel config with one from another distro? I would like to build an OpenWrt image for x86/64 using Arch Linux's linux-lts config file. It is as simple as copying it over to target/linux/x86/64/config-6.6 in my build system?
Try not to duplicate, draw diff from kernel configs and apply differences bisecting, i.e all, then half etc until regression appears back.
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Erm, I would say nope for most folks...
It really comes down to each distro has a focus, and many patches and configs are local for the tasks at hand.
It's going to be easier to selectively enable the features you're looking for, rather than massaging another distro's kernel config into a shape that works with OpenWrt. While this is relatively straight forward on a general purpose distribution (and even there you do have to take some considerations for things that need to be configured differently), OpenWrt is everything but straight forward in this regard, so this wouldn't be among my first 5-choices of kernel development/ tweaking.