Wouldn’t grabbing a coinmech from one of the video games be a natural solution?
You could wire up a mame cabinet so the coin drop would wake up the computer from sleep mode, you could even select what the contribution was for (solder, etc.) with the joystick. That makes it a competitive game of sorts, which might spur more contributions.
But, if the hive is working on the honor system, you could accumulate QR scan codes as IOUs and settle everything within the hive, once you reach a threshold or a collection period, say once every three months.
I like the idea of coins, they have one decided advantage: They work in vending machines.