if you are changing the oil anyway, i have a pressure tank i fill with oil and 45psi, then attach the outlet hose to the oil pressure switch/gauge tap, then push the needed quantity of oil through there.
it seems to work, as there is instant oil pressure upon start up. as i always do, the filter is filled before installing it.
however, i have often wondered just how the oil goes through the engine passage[s] using this method, and if it works like i hope it should.