Look into the GUN4IR project. They have drop-in replacement parts to make the Guncon work on LCD monitors.

There’s also the GUN4IR project that can be put together for a fraction of the cost of the Sinden. The Sinden requires a visible border around your game.

Maybe that’s not the way in. I always come across incredible pdfs on Google that are hidden away on arrl.org. Old magazine scans and other articles.

I’m sure there’s something in the ARRL library. https://www.arrl.org/library