I want to speedrun this game on PC but I do not have Metal Sonic. I do not want to buy him just to have a decent time, is there any way around this?

if you dont use Metal Sonic, Sonic is probably the best choice. But you wont be able to choose from different mods from the start and youll waste time after races for levelling up

Oh well I guess thats all I can do because I am broke :/