There are two ways, first way you will have to add a second hyd. remote to control the "clamshell" on the bucket. It's just like adding hydraulics for a
grapple. You would then run the lines from the rear remote under the tractor to the front and the mount a quick disconnect somewhere, either on the loader arm or the crosstube. There you would have your plug-ins for the connectors to the 4 'n 1. The control would be your lever (w/ remote kit) to be added next the the 3pt. lever.
By the time you add your rear remote and then lines and couplers up the the front, you will have @ $8-900 in it plus your bucket.
Second way you could go is w/ an electro-hydr. control which would allow you to control the bucket w/ an electric switch which then actuates the hyd. cylinder on the bucket. Then you wouldn't have to add a rear remote. It would be the less expensive way to go.
What does your dealer recommend?