It may be that everyone has been doing this and I'm late to the party, but...
It hit me the other day that I could fab up a few -10 male ends and a section of clear tube that would allow me to connect the oil lines together, and priming the engine oil system right on my lift cart by putting 12 volts dc to the starter w/ a jumper lead from a battery, neg side to ground on cases.
It worked like a charm and is a bunch easier as you have complete access to the oil filter which I usually leave a bit loose until I see oil weep, etc...
All I did was cap the ends of the lines and install away...