Even though you said this wouldn't fit on an Innova DISCatcher Sport basket I have used it on mine at home and also on our local courses full size Innova baskets. It really makes you zero in and being even 1 inch off can cause you to miss. My buddy and I had a good time seeing who can sink more putts from varying distances. Lately I was in my local disc store and heard a guy discussing his fun (and frustration) with his. The frustration being how much more precise your putts need to be but also loving honing his skills while using it.
This product shows immediate results. Not only does it give you accurate feedback, but it forces you to focus in on where your'e aiming for a consistent putt every time. Multiple sizes and holes gives you added difficulty for those tricky putts. You can rotate it depending on your putting style so it's perfect for everyone! I use it so much.
I have tried every trainer out there this helps focus vision and putt to the heart of the basket or it is rejected I recommend highly
You might want to take a closer look.