I do a pre-lube/re-lube that I made up from a cheap 12V transfer pump and a few fittings.
Doesn't supply much pressure, but does push oil from the pan into the engine, you can tell by hand-turning it.
Used a quick-drain pan fitting, tygon hose in & out of pump and into pressure gauge fitting.
Not sure if that's what you're thinking of doing, but it's inexpensive and pretty easy.