The current fastest is probably:

-Have a friend boost you to lv15 by killing lv49-50 mobs that you tag.
-Run a few Satasha
-Run dungeons with a full Offensive Mastery 5 squadron in the order of the lv20, lv24, lv32, lv41, lv47, lv53 dungeon, skipping any others. Do this to lv61. Even ignore Roulettes for this.
-Roulettes + HoH to 70. As a bonus the hair style from the hoard sacks still sells very well.
-Pixies/Roulettes then just run dungeons while doing Fates during the queue.