Yeah i usually just go with j2 a2a - 112 SS
You can also opt to go for j2, 112, db2(charge)
Depending on your opponents wakeup options you can get the overhead pop pop, meter burn, and SS-TS.
It just hit me as of late that besides the lack of a trait and a good overhead, harley lack a2a combo potential. Every other char can do their entire bnb off an a2a =/