You didn't say so I am going to assume you need two controls for the loader (lift and bucket). I am also going to assume you have 4 ports on the valve (two for each lever).
PTO pump - Tractor hydraulics are going to be slow, usable but slow (flow thing). A PTO pump would have it working just they way it does now on the 3000 using the controls that came with it.
Quick attach couplers - This way you could disconnect the bucket and connect the cylinder. A bit more tricky as you would have to have the bucket on the ground, disconnect both lines with no pressure on them. The connectors should keep the bucket from moving when lifted off the ground. Same deal hooking back up.
Selector valve - A control when the knob is out directs the contol to one device, push it in directs it to the other. Put in line with the bucket (can still lift when cylinder is in use) and you do not have to fiddle with anything, just select the one you want to operate (see link).