Do you already have the PB installed? There are LOTS of post's from us JD guy's who have plumbed a valve into the PB lines to add 1 or 2 rear remotes. But if you only need a new circuit on the FEL than a electric diverter may be a better option, and gives you control right on the joystick. I can post links later, but in the mean time try searching these words:
diverter
WR Long
remote
grapple