if you time up the solo stars on the headliners solos so that when you get within 1 of the legends solo rewards tier you go play one legend solo to get the legend token, you can get enough stars to get 18 legends tokens today.
they really blew this one and need to patch asap
adding more explanation:
so like, lets say you have 0 stars in any solos....you do 6 stars in headlines solos, then go play 1 star in legends solos to get to 7 (i think you get a token every 7 legends stars), then go back and do 6 more stars in headlines and get 1 star in legends and u have 2 tokens....
if you keep doing this, back and forth you can get 20 legends tokens. you will need to play the same solo once for 2 stars and then again for 4 stars on headliners solos as you work your way up.
since the stars count on each path, you just can't hit a trigger star level on the wrong solo or you will skip the rewards.