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
Minox 35 GT | Ground-Glass .net
Minox 35 Battery + Adapter for Minox 35 EL GL GT PL PE EC C by Ausgeknipst | eBay
HQRP 4-Pack 6-Volt Battery for Mamiya 645 Pro TL / RZ67 PRO II, Pentax 67, Minox 35 ML, Zenit (Zenith) - Walmart.com