[ryandamm]

This is called “ghost frame” and already exists in Red cameras and virtual production wall tools like Disguise.

[actionfromafar]

You need to basically timecode/genlock the greenscreen "illumination LEDs" to the camera so the greenscreen lights up only exactly at every other frame. Not sure if there exists any off the shelf solution which can do that but if not it can't be super hard to cobble together.

[cma]

https://evermorestud.io/retroreflective-chromakey-experiment...