[__mp]

You can use better dummy to achieve a similar resolution: See here https://github.com/waydabber/BetterDummy and this MacRumors thread https://forums.macrumors.com/threads/m1-mbp-lg-34-inch-ultra...

I tried it on my M1 Mini + LG5K2K and soon disabled it again. The performance impact was noticeable in Lightroom and the display adapter config got in the way once I switched display input to my work laptop.

[cehrlich]

Let me rephrase that, I'll switch once I can do it in a non-hacky way.

It should be possible - 6880x2880 is fewer pixels than the Pro Display XDR, which an M1 MacBook Air can drive perfectly well.