With respect to terminology, when you are new to EVs it's totally understandable. Here are a few corrections to help you out:
Any way to charge at 6.6 kw without the supercharger port?
The supercharger moniker is a Tesla thing. Nissan refers to L2 charging as "normal charging" and calls the J1772 port the "normal charge port". The J1772 "normal" port is included on all trim levels and lets you charge at L1 (trickle charging) and L2 (normal charging) EVSEs.
I see a lot of aftermarket cables, chargers, etc. and was wondering if any of them would allow a non-SC port Leaf with 6.6 charger to charge faster than trickle
The correct term for the L1/L2 device that you connect an EV to is "EVSE", not charger. The actual charger for L1/L2 charging is built into the car and you'll usually see that refered to as the OBC on these forums. To further confuse matters, when doing DC quick charging at a DCQC station, that device is actually a charger.
My understanding is that US market 2018 LEAFs, in the S trim level, include a trickle charge only EVSE (L1 only). On higher trims, you get the combination L1/L2 EVSE. However, if you live in Canada, then all trim levels include the combination EVSE.
Vancouver, CA owner of a 2013 Ocean Blue SV + QC, purchased 01/2017 in WA
Zencar 12/20/24/30A L1/L2 portable EVSE
1-1/4" Curt #11396 hitch
After market, DIY LED DRLs
LeafSpy Pro + Konnwei KW902 ELM327 BT OBDII dongle
Loving my first BEV