Easiest way is an electric over hydraulic splitter on the curl circuit then hard lines from jd up the loader arm. My dealer did it for me with a fasse splitter. The splitter they used came with the hose to connect to the existing loader quick connects and a bracket that attaches to the loader mount. It is controlled with a push button on the joystick.
Sorry, I just looked at my paperwork and they didn't break it out on price. Not sure where you are in relation to Longmont, CO but it was Longs Peak Equipment in Longmont that I bought my tractor from.