- Install Sunshine.
- Install a dummy monitor using VDD and walkthrough the readme.
- Install Monitor swapper and walkthrough the readme.
- Setup a Moonlight client on your client of choice, eg LG TV Moonlight Client
The dummy monitor is needed for Windows as it cannot stream an arbitrary resolution without a "monitor" supporting that resolution.
The monitor swapper automatically swaps between your ultrawide screen and the dummy monitor, which effectively streams any resolution you want to the client of your choice.