are you sure you cant use official tracks? and not just give them different names? I see games on Steam where there are official tracks in non-F1 licensed titles. You could just make like one or two variations on the track and that would be enough i think.
I understand changing driver names - but you have just use three letter abreviations so surely just say taking the drivers of the 91 would be okay ? - or make variations like the F1 Circus games used to do - N Madsel, A Senta, R Petrazi, A Plost, G Mortabella, J Elasi, M Schoolmacher, etc