One thing I did recently, was look at the most effective way to get wireless controllers hooked up to my Saturn and came across this: http://www.racketboy.com/forum/viewtopic.php?f=52&t=31495
Saturn purists will probably hate it but I think it works exactly how I need it to - not sure if this has been shared in here before but I came across this on my own through digging. I did end up buying an IR official Japanese controller off eBay, but it didn't include the receiver and was like $80.. guess I have it for my collection though / can put it on display but stinks. A lot of information isn't readily available unless you already know where to look or from experience it seems as I'm newish to the Saturn scene.
I sent a message on the 8bitdo (The guys who made the awesome Bluetooth NES retro receiver and replica Bluetooth controllers) website for bluetooth 6 button Genesis, and Japanese style Saturn controllers, and retro receivers for both systems. They said they will look into it. Sales@8bitdo.com is their email! Please request respectfully and responsibly.