Car booster seats for adults

Hello exdancer. I used to go to cricket matches at large grounds , and sit on hard plastic stadium chairs ( no covering as out in rain) I went on Amazon and bought a firm, shaped non slip cushion specifically designed for this job.It is brilliant, doesn’t ‘crush’ down, and is supportive for at least 7 hours. That would be perfect for your needs, 🤞
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I have a wedge cushion and have a car with option to raise seat and also move nearer foot pedals. The steering wheel also adjusts to suit me. The model of car is tall and large windows so it works well. Some cars do not feel right to drive with seat in forward position as your face is too near a sloping windscreen and top of head too near the roof. I am 5' 2"

I have this problem too ! Driver's seat raised all the way, still need more height.
Mind you I have shrunk, can't even reach kitchen shelves either !

I'm 4ft 8inches and struggle too. Steering wheel column is lowered and seat cranked up but not high enough. I have a wedge seat memory foam cushion but it does sag somewhat rather than keeping me boosted. Time for me to get a different cushion!