I recently got myself the Hotone Ampero mini and had to do some work to get the DIY expression pedal I have working properly with it. I also wanted to test out how the single and dual switch would work in my setup. I made a video about how the DIY solutions work with this unit and also how to make them. You can follow the diagrams if you wanna make some.
I usually shop here: https://www.taydaelectronics.com/ for my parts. You might wanna look at https://lovemyswitches.com/ or https://www.musikding.de/
Dewil 