Trust me, the disease isn't as bad as the cure...
I sat in FFR's GTM at London years ago (maroon I think?). Same deal, I'm 6'3". Very difficult in/out but the seats had huge bolsters. For me that was doable, but I was worried about headroom /banging a roof bar - especially with a helmet. But I loved it - and so did my wife which is essential- so I bought one. Now I'm dealing with my self imposed purgatory of making it more personalized, basically giving it a new cockpit.