How about using the objectives from a 60 or 70mm travelscope to create your own Binoscope?
Provided you calculated the focal length correctly, a 45* fixed mirror and 2 star diagonals, or three star diagonal joined correctly would give you an adjustable IPD that is independent of the distance between the objective barrels...
Below is a drawing from Cloudynights - one of the members made a "binobox"....
cheers
Jeelan
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