4k 3D macro frame from video

The video clip have nothing interesting in it (no bugs, nothing special), it was captured just to adjust some macro parameters.
Frame width per eye is 48mm, working distance 19cm, distance from subject to sensor is 31cm, distance between lenses is 9mm, f:11, custom made macro 3D device.
The 3D depth in focus plane is very good if the clip/image is viewed with a VR device.
The overall depth, so including the background, is too large for viewing on large screens or with VR devices. The problem is specific to 3D macro images, where compressed/shallower backgrounds are recommended.

3D images with exaggerated depth cannot be comfortably viewed with VR devices or on large screens.
3D depth should be calculated in advance for the size of the screen on which it is intended to be viewed.

For the cross-eyed viewing. For viewing on VR device it is necessary to invert the images (parallel mode).

A long time ago (2011) I made some videos with two Nikon D5100 cameras in 1080p (lower quality at the time) and a custom beam splitter (with 50/50 mirrors).

2x Nikon D5100 cameras + a custom 3D beam splitter (inverted pair for cross-eyed viewing)

But the newer single camera solution gives much better results (for 3D macro).

Sony A6300 + a custom 3D dual lens system (inverted pair for cross-eyed viewing)

For my purposes, 1280 x 720 pixels/eye is a far too low resolution. The Sony A6300 can shoot 120 fps at 1920 x 1080 resolution, but it's still too little. Even 2x4k resolution is too little for high quality VR devices, which offer screens up to 2560x2560 pixels per eye resolution.
Preparing materials for VR devices requires a completely different approach to photo/video classic materials if even minimal exploitation of virtual space is to be achieved.

I will be testing the preparation of 10,000 x 5000 pixels (5000 x 5000 per eye) resolution video material, to allow for head tracking around the area in which the subject is framed.

The problem is that the videos will only be viewable with customized equipment.

I'll show you an example of a 10,000 x 5000 pixel video frame.

A 3D system with 2 x Blackmagic URSA Mini Pro 12K is far too expensive and far too heavy. It is not justified for my needs. I need a system that is as easy to carry and handle as possible in hard to reach places.

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So I mounted two slightly enlarged 4k clips with a crop on the width (captured with two Panasonic GH4) and mounted them in 8k format. The idea is that as much space in the frame as possible should be taken up with information to allow navigation in the virtual space beyond what is marked in red.

The inside of the red frame contains 2400 x 2400 pixels and I want the image contained in 2400 x 2400 pixels to give as much detail as possible to the viewer.
A 12k frame could contain information that would provide navigation in a 180* 3D space at reasonable quality.