A while ago I posted my telegraph key I've found at a flea market, here's the video on how I made a little breakout module that allows me to use it as a eurorack controller (with some jams). It's a ton of fun.
Maybe I'll make a proper module for use cases like these (dual foot pedal, telegraph keys, pretty much anything with two analog buttons could be used). I've added a little mockup on how that could look at the end. Let me know if that's something you'd be interested in!
If I ever get around to making it, it will be available as open source files you can get manufactured wherever you prefer.