I made myself a little pump primer to spin the pump, for occasions like this. With the clutch not yet on, I place the bike on its sidestand and pour a couple of quarts of oil into the pan. Hook the primer up to a drill to spin the pump, and let it spin until the oil starts to flow out of the transmission input shaft. The primer is just a 3/8 inch rod with a brass sleeve and set screw on the end to grip the oil pump shaft. I have done this for most of the bikes I have had in the past that have gear driven pumps, it eases the worry about the pump not priming in time to prevent bearing damage.
Regards,
SJJBusa