I wish I could say the same about the drivers side. I have you beat by 5 inches. I couldn't care less about the passenger side. I'm trying to find a way to fit with some comfort.
I attended a demo ride & a guy had the PRP seats. It was a little better than stock. The 2017 SL seats seem to work best so far. The salesman said I would need at least 4-6 more inches of legroom. It would take a drastic change to accomplish that.
I called slingmods with that idea. I was told the adapter would put the steering wheel too close to me. I'm hearing the Shaq mod alot. It's some serious coin for that.
I've seen a video with Blake Griffin in a Slingshot. He's listed at 6'10" & he fit better than I do. I'm scratching my head on that one. A top on a Slingshot is out of the question. I can't do the Limbo!