I was able to find replacement handles at a local RV parts place. They're easy to strip and I've had to replace 3 (IIRC) out of a total 6 handles.
Just checked my crystal ball and I can see replacement faucets in my future.
2013 F-350 CC SB 2WD 6.7PS
2013 Eagle Premier 351 RLTS
-SOLD- 2012 X23B
-SOLD- 2003 Ford Expedition 5.4, Bilstein shocks