To All:
I use a blow-molded garden sprayer, plugged into the main oil gallery via a
barbed hose fitting in the pressure port. I keep pressure on the bottle until
I see oil at all of the rocker arms, indicating the push-rods have filled.
Pre-luber is then removed, oil pressure sender replaced, sump topped up.

I've used this method for more than twenty years on VW engines. And one or two
others :-) Seems to work okay.

-R.S.Hoover