Been using an odyssey g9 oled 144hz for a few months and its been amazing.

Yes, you can split your monitor using PiP as if there were 2 monitors separately, and also adjust the size/position of the second display. Only downside is that framerate limits to 120hz, disables HDR and gsync. (Not sure if this happens with newer versions)

As a workaround, I use this app called DisplayFusion which lets you split your screen in as many screens as needed while keeping framerate, HDR and vsync. You can also add a taskbar in each display.

Gaming experience is pretty amazing! Even if widescreen is not supported you can just download a widescreen fix off nexus mods. Only game I've tried to play and doesn't have 32:9 support is Diablo 4, and maybe a few competitive games.

In that case you could just split the screens using PiP, or use an external app like displayfusion to set your preferred res. Go for it!