I think its neccesary to seek specialist advice, the last thing anybody who drives such a luxurious vehicle wants is aches and pains,
I had a similar problem to yours and cured most of it by purchasing a flame retardant racing suit and a pair of suede racing pumps, you really get that racers edge when you can feel the loud peddle thro the waffer thin racing shoes.
I’m actually 7’5″ and drive an Austin allegro so my situation is completely reversed but I would still highly reccomend the proffesional advice an expert fitter will give !
You could try a helmet, I find that looking like the STIG and standing with my arms folded makes me feel important, you will get away with it in your can because your head is so small and your car is so big, I can only wear mine outside of the vehicle because my head is so big and my car is so small !
You will also require gloves ! This will make you feel more connected with the whole experience, just be carefull when your stood on a stool in the Mtwy services having a piss because whipping it out of that suit “all in one” Onesy ! In gloves will see you cascading all over the place, and once the gloves get piss on them you will have to go back and get re fitted, that’s how exact the science is, it says so on the invoice !