[pogobill]

I've seen these sorts of things.

Hydraulic Third / 3rd Function Valve Kit w/ Joystick Handle for Tractor/Loader, 13 GPM - FREE SHIPPING

Third function kit allows you to add an electronically controlled hydraulic function to your equipment without the need for expensive factory add-ons. - FREE SHIPPING

summit-hydraulics.com

I was going to look into it for mine, but decided to buy two long hydraulic hoses from the outfit I bought my grapple from. I just hooked mine to the rear remote and it works fine. I don't use it all the time so it's good enough for me.