Today I had an epiphany. I was down under the car and noticed a large hole in the bottom of the body right below where the gas tank used to be. The hole actually opens into a protected area where the steering rack lives.
I started by running an exhaust tube from the battery pack's fan port down to the hole.
This gave me the room I needed to mount the original windshield washer fluid tank back in its home, and run the output tube to the new electric washer pump.
And the beauty is I got windshield fluid squirting out both jets the first time I tried it! This meant that the replacement 924 electric actuator lever and new electric pump worked just as I planned. I'm happy I was able to ditch the ugly but functional fluid tank and go back to the original.
Even though the tank cap looks like it's in a low position, I was able to get a lot of fluid into the tank. I don't plan on sealing up the hole for the spare-tire-pressure-hose, as it will act as a pressure equalizer.