I did a a bit of digging. Kubota p/n for your FEL valve should be 75540-61013, which is superseded by 75540-61014, which is a valve made by Husco specifically for Kubota, carrying Husco P/N 5000-B214 and/or MDL-2075. Brand new that valve costs about $800. Searching eBay for the Husco p/n I found a guy who apparently bought up a failed Kubota dealership and is selling all kinds of Kubota loader valves at half price or less. I don't see that exact valve but I'm betting there's something there that would work. I can see from some of the pictures, that on some of the models, I should indeed be able to remove the joystick and attach my LS linkages directly to it. Then it would be a matter of mounting logistics and getting the right hose adapters. Not sure I want to pursue this but it's an option on the table . If when I go to the dealership and try the other tractors, in still not satisfied with the performance I might seriously consider this. Here's the eBay store I was talking about...I can't see any numbers on the valve but Messick's has the loader parts diagram (for TL421) and lists several valves. Other Kubota models may also have very good valves, particularly the other industrial TLBs.
| eBay