I ran across this surfing the web for modded V1 migs to include a switch. This guy on Reddit claims to have done the mod and posted a video to demonstrate the switch working to cycle games. Only thing is they didn't release a tutorial, or how-to guide. Maybe contacting them directly via a private message? Here is the post with the video. Don't know why they didn't release the how to personally. It makes the post and video more of a tease than actually helpful. Here is the link to the post... Someone speculated they used a normally open switch, and set the switch/button to create a short circuit leading to the game cycling. If that's the case, it might be risky to use? Thought I'd post it for what it's worth.
https://www.reddit.com/r/SwitchPirates/s/i3GTH5Iopp