Hi, I've made a two player split screen VX script.
It is not 100% what you're looking for, but you can give it a try, maybe there's just something I can fix/add.
There is just a problem, the demo is in italian. I don't know if you understand.
I planned to translate in english, but I ended up thinking this wouldn't pay the time I'd have passed on that. There's such a LOW request of split screen script xD
By the way: Two player split screen demo
You or someone could find that useful.