Fitting 60 degree angled nipples makes access infinitely easier, but the real key to long kingpin life is to use hard chrome kingpins. It's not expensive, they are 120 quid for a pair, and fitting them is pretty straightforward for the home mechanic, no special tools are needed.
I grease my front end every couple of thousand miles, and when we stripped out the front to fit the Suplex kit we found no measurable wear after over 25k miles. Stories abound of people getting 100k miles out of their hardchrome kingpins
