After Yuzu got shut down I'm not sure what this leaves people with for switch emulators. I'm going to try and find archives and will update the post when I do.
Last windows build: archive.org
Slightly older, but has linux and mac builds archive.org
Okay there we go, a github mirror: https://git.naxdy.org/Mirror/Ryujinx
Yeah. It's not easy, but if you're a competent assembly programmer it's all fairly straightforward at the theory level.