Maybe the best idea I have shamelessly borrowed from someone on the internet. If you have tried to change your fluid on the TR8, you know how difficult it is to get to the filler plug. All you need is one of those little 12 volt compressors, 3ft. 3/8" O.D. clear tubing and an air needle (toy/ball/inflater needle).
WARNING: This fills fast at just a few pounds of air pressure. Takes maybe 30 sec. to empty a quart pulsing the compressor. I wouldn't even think of hooking it up to some sort of shop air. Watch the jug or you may blow it apart.
Drill a 3/8" hole in the cap and a small hole in the neck of the jug of fluid. Careful, turning off the little compressor does not stop the flow of fluid. If it starts to overflow, pull the needle and let the air out of the jug.