The piston can also rotate in the bore which has nothing to do with lubrication.
If you don’t already have one I highly recommend their DPK. I’ve done two coast to coast crossings with mine with no issues whatsoever.
If you do lose a pump you’re only out the pump and the filter.
https://youtu.be/F-vZEH1yEs8?si=QBJbLVjgdTEIQfsH