[DonC]

I picked up a plant sprayer with a hand pump to pressurize it's container (4 qt. capacity) at Home Depot. Removed the screw adjustable nozzle and added about a 2 foot length of 3/8 surgical tubing just pressed over the remaining nozzle on one end with about a 6 inch piece of aluminum fuel line with a 180 degree bend in the other. Total cost about $15.00.
To fill the transmission remove the fill plug, add transmission fluid to the pump bottle, pump up the pressure and hang the curved aluminum fuel tubing in the fill hole. Press down and lock the release lever for the sprayer and just monitor the level of fluid in the sprayer as it goes down. As it gets near where I think it should be I monitor the fill hole and as soon as fluid starts to emerge I shut off the sprayer, wipe the excess off the outside of the transmission and put the fill plug in.
Whole operation takes about 15 minutes. The fluid moves slowly enough so there's very little spillage.
DonC