Did you think about implementing any outruners cars? I played a lot with mad power (1993 Lamborghini Diablo allways my favorite sport car) and bad boy (1965 AC Cobra lovely machine) at the time...But I remember most of the cars with great affection.
I tried to open the Excel that you left on the page but it says that it is damaged. so I can't create something...however... they won't be the ones from the original arcade but I guess I have this to contribute:
https://www.spriters-resource.com/genesis_32x_scd/outrunners/