Only for normal grid races :
now online leaders are in A world : why dont put them in 1st and 2nd positions on grid  of
                                                                        A world (for leader 1 and 2) 
                                                                        B world (for leader 3 and 4)
                                                                        ...
then complete  3th and 4 th positions grids  with other racers. It's hard to race in A world because there are good racers in and sometimes , u have to share the road during whole race. when you start in C world on 1st grid pos, after 1st trun u got the entire road because slow racers crash quickly. 
 
  i think it could hard to do!