Built two of these today and had decided to try and find a double y so good to hear there is such a thing. Looking forward to photos when you update.
I had slightly different fitting and ended up having to add a little 22deg extension piece to the opening because they were scrapping the food out onto the floor.
What did you use? My girls are making a HUGE mess. I had read over and over that the PVC was the way to go to reduce mess and waste. It's not been my experience so far. Here's a couple of pics. What did I do wrong? Or what can I do to improve?