Roller fairleads are fine with synthetic (actually better, since they roll they don’t build up heat/abrade the synthetic line) HOWEVER you definitely need to replace the fairlead if it’s been used with steel cable because it may have burrs/rough surface. Also need to make sure the gaps between the rollers don’t allow the rope to get pinched.
I have the OEM hawse fairlead on my 2019, but am looking to replace it with a roller fairlead. If not pulling straight on, the rope wears against the fairlead substantially, and the powdercoat is pretty abrasive.
@OP, use either “the grabber” by bubba rope, or this knot to attach synthetic to the drum.
A safe and simpler way to attach a synthetic winch line to your winch drum. Fits all brands of winches.
www.bubbarope.com