The easiest way to add a hydraulic circuit to the FEL is with a electric diverter. I basically splits the dump/curl circuit into another circuit. I put one on my FEL last year to operate a snowplow that I made and for a future grapple project.
It is really not that hard to do, but will cost about $400.00 to get all the stuff to do it.
Do a search for "electric diverter", there is lots of reading on this subject. Just be sure to change the date range to "ALL POSTS", as it defaults to one week.