The battery issue (which is actually a blessing in disguise, IMHO) is easy to solve. 1) Take the batteries out and take them to a hazardous waste disposal center. 2) Expose using more accurate methods than an in-camera reflected meter. 3) As you print your negatives, thank yourself for doing yourself a huge favor.
I have done the 475-in-a-washer battery mod just as backup, since it is so easy and cheap. But the times I have actually flipped the meters on and used them can probably be counted from memory.
Wein Cells are a joke. They are slightly-modified 10 cent hearing aid batteries in a fancy package, marked up several thousand percent.