A keyboard fits on the tray a lot easier than a laptop if youve never tried it.

Might want to check out the Tap XR.

https://www.tapwithus.com/product/tap-xr/

From the video, you can just turn the headset into an external display for your Mac (by looking at it). This is critical since I'm doubtful I'd be able to get much work down in visionOS alone.

The use case I imagine is that you still use your laptop keyboard and trackpad like normal, but now you just have a screen floating above it in whatever the ideal size/position is for you. For this to work of course you have to still be able to see your laptop. But if the marketing is to be believed it'll do that quite well.

Either bring a keyboard (like a low-profile mechanical keyboard) or fold your laptop screen down half-way and dim the screen.