Rough rider proxy

As many others I don’t like the rough rider on horses, so I would like to proxy them on bikes. I looked at many sites but I couldn’t find something fitting. I know there are the grim guard biker, but I want to go more into a cadian/desert raider astatic with dirt bikes. Then there would be the gsc jackals, but they are really expensive and I would need two boxes for 10 man squad. Maybe somebody knows a stl file for that would fit the style or should I just try to find the jackals somewhere cheap?