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It uses a 10 ohm resistor on the output to mimic the internal resistance of a typical coin cell, and the voltage converter has a 250 mA current limit and protections built it. USB-C connector, USB CC resistors onboard so it'll work with any USB power source. If this is useful for you, let me know! I'm about to get a pile of them made and can do bulk pricing if you want 100 or more. Still need to finalize cost, but can prob do somewhere in the 35-75 cent range depending on qty.

I'm also getting some 5V output ones made for our kits that use 2x 2016s stacked in a holder. This passes USB out with a 10 ohm inline resistor and PTC fuse with a 250 mA current limit. If you have boards with a different style of coin cell holder, let me know. I might be willing to take the time to make different versions of this. Finally, yes, I know this makes your finished kit less portable. Not much I can do about that.

@vxo There's a 3V regulator and a 10 ohm resistor inline to mimic the typical internal resistance of a coin cell battery. While I've made converters without this and they've been fine with all of our boards that rely on a typical coin cell's resistance and hook up LEDs directly, I figured this would prevent any other kits designed like that from blowing up LEDs.

@mike I actually have that board too, I made it years ago to make hard-wired displays for our kit when we go to shows, but it's useful for a variety of things. It's made with 3.2mm thick PCB material, no stacking needed. But yes, does not help with compliance, sadly.
https://www.alpenglowindustries.com/products/coin-cell-power-board

@axwax @alexglow Ooooh yeah! Here's a link to that for others, around 40 mins: https://www.youtube.com/watch?v=nkEdGQEJBuA