It's alive!
After finding and implementing this fine camera battery hack, the Minolta (more specifically, "the Minolta's light meter") lives! Total cost, about $1.23 (battery plus wire). The hearing-aid batteries used won't last as long as the $30 adapter'ed alkalines would, but at $0.43 each, I'm not complaining.
I'm gonna stop by CVS tomorrow and see if they have any of that old tyme "film" stuff on the shelves.