Go with a bellows plus macro lens on a DSLR - a old slide duplicating kit with a reversed 20mm in place of the regular 50mm will do nicely (and a Luminar might resolve things out of your Minox negatives you've never seen before).
I am not aware of any scanner with optics zoomable or focusable down to Minox scale, so the resolution of a scan would be very low, and focus and planarity problems would be critical In my experience even scanning 110 (with almost four times the area of Minox negatives) on a CS9000 delivers rather disappointing results compared to the above duplicating rig with a 6MP DSLR.