Thanks for your writeup!
I did in fact apply for the Apple Vision Pro dev kit, as I had similar ideas about Hype + WebXR content. However Apple was silent never sent one (as is the case I think with 99% of all developers that applied).
The visionOS simulator does have flags that can be turned on for <model> tags and WebXR content, but the issues really here would be:
- They are still off by default. I was hoping they'd at least be on by the end of the beta period. If they are not on or will never be on, then the opportunity for this is very small.
- Most sites that had WebXR content didn't recognize Safari as having a usable XR device
- Some that did still didn't work right, and still showed up in a small window instead of taking up the whole space (incorrect)
It isn't clear to me if these are simulator limitations or device limitations. We'll find out on Friday 
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For what it is worth, I did experiment with WebXR long ago with my Quest and found that event that device could competently display content with reasonable performance.