[Jdub]

First off, do remember to remove the fill plug before the drain plug in case there are any issues.

Sure, why not? If a gravity feed is your method then you are only looking for the quickest way "up". On the negative side you are introducing heavy sulpher fumes inside a cabin. If you can picture this, my car is jacked up for (level) access and a hose is introduced into the fill point then threaded up to the side of the car, where the tube and funnel are set in place using blue painter's tape. Now I have a pan under the trans for overfill, and I put in my very best estimate of fresh trans fluid just before closing shop. Next morning/visit, I remove the tube and gravity has filled the trans to the fill/level hole (use forefinger and check pan for tell tale overfill amount confirming full amount).