Found a Minox 35 GT in super good condition (just needs a good clean). I adapted the battery compartment to use 4 LR44 cells, that are about the same size of the
Testing a Minox 35GT | burnt embers
Adapter + 4 batteries A312(1,4V) for MINOX 35 (GT, PE, PL, EL, GL, AL),
Minox 35 GT | Camerapedia | Fandom
Minox 35GT - battery problem solved - YouTube
The Mighty Miniature Minox - Classic Manual Film Cameras - Photo.net