This is what I've been worried about. I have lens implants so I already have a fixed focus as well. The combination of the two would likely be a problem.
In a VR headset the virtual screen distance is set by the distance of the microdisplay from the lens in the headset.
It's not crazy to think you could move the microdisplay position and get a virtual display at 6". There might be other optical consequences (aberrations, change in viewable area) but in principle it can work.
You can get a free trial of an Apple Vision Pro at an Apple Store.
Even if you have absolutely no intention of ever buying one it would give you a free and easy way to find out if a headset type device would work well with your vision or just be totally incompatible.
