Actually, you can easily do the mod there yourself (I just wanted you to send me a Lou Malnati's Deep Dish Pizza in return).
You will need to compare the length of the standard EB filler tube with that in the Junior. Also compare the depth of the water level overflow in both models. Then trim the clear Sensor Tube of the AWS to normalize these 2 factors for the Junior model.
If I can find a local Nursery who has the Junior in stock, I'll make the measurements for you and send you the new Sensor Tube length to cut.
Raybo