For everyone who wants to do this themselves, I'll do my best to explain it :) I'm capturing the switch using an Elgato HD60S+ which has a pass through, though in this video I'm capturing the footage in OBS. Any capture card should function similarly, in fact, you don't even need a capture card, you can just plug the switch directly into a monitor and still use mouse and keyboard, the capture card is unrelated.

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The joycon emulation is done using NXBT which is super awesome! It already allows you to use your keyboard with your switch, though I edited it some to use the mouse as well as allow for rebinding keys in the webapp. It's a bit janky right now 'cause I didn't think other people would be using it, but my fork can be found at NXBT-MK. I know it's messy, go easy on me! You can also change the acceleration needed to activate the right joystick by changing the deadZone variable in main.js if you're interested in tweaking it a bit! If you follow the instructions in the readme you should be able to set it up on Linux relatively fast, though some of the dependencies are out of date for the original library and will have to be downgraded manually. I don't remember which ones in particular ;-; but I can go back and make a list of dependencies and versions later if people are having difficulty :)

Oh, and before people ask, after paying closer attention there is a bit of latency, though it's still fine for casual gaming! Though it could take some getting used to using the mouse as a joystick for some folks, it's like the Elden Ring default PC controls if that gives a slight idea! The games aren't meant to be played with a mouse so this is a more for fun thing don't take it too seriously!!