Have you tried using pipes/kitchen towel rolls?

As in, try doing something like this:

1. Zoom the images small enough to be almost parallel to your eyes.

2. Make a binocular out of used kitchen rolls.

3. Each side should look at exactly one of the images

It should just work. Both images should converge like they do in a binocular.

(you can then try removing this DIY binocular suddenly and see if you can maintain focus)