Guy modded his steam deck be as small as possible, with the only intended use to be to play with an external controller and AR glasses.
Finished photo: 
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That actually is something that I've been contemplating doing. I never use the built-in display - HMD glasses are just much nicer.
Recommendations?
Previously, I'd have recommended Xreal Air but the company is allergic to open-source and doesn't have a great track record of supporting their own software. At the moment, Viture seems a better bet, from those that I'm aware of. For screen replacement, the high pixels-per-degree of birdbath optics, like both use, are extremely advantageous and cause much less eye strain. And that's while being far cheaper than waveguides or pancake optics.
Thanks!
A slight modification as I have new information: If you can justify it, the Xreal One might be worthwhile as they have added an ASIC to do away when the buggy software and dongle nonsense. Still not super open-source friendly (they're not actively hostile either) but that seems to solve my biggest issue with the experience. They seem to have better quality optics as well.
I may end up getting a pair of those to replace my Nreal Airs that are held together with tape and CA glue (I'm unfortunately hard on my electronics).
No problem! My "dream" HMD would be birdbath optics with ~2k displays for each eye and probably some simple hardware upscaling. The glasses being "dumb" is a real perk. Doubling the pixels/° would make the experience that much better.