You can change the PC's blowers with a suck pump, you'll need to reduce the size of the hose a little bit on most of those draw style pumps for it to fit down in there easily, and you'll still have to wiggle it around to hit bottom.
Just do it right after your last job when the oil is good and hot - it will take you an hour to draw it out if it is totally cold.
Like Jimbo said use AEON PD and nothing else for their blowers - with that oil, you can go 4500 hrs or 2 years, whichever comes first (obviously it'll be the latter).
On the PC's, you can use a similiar trick to fill the water pump case. Get a squeeze bottle mustard style lid, a cheapo piece of clear hose, 3' long from lowes that the bottle tip seals itself into like a barb. Fill your mustard bottle with pump oil, push the mustard bottle into one end of the hose, the other into the pump case, and squeeze away. Beats the hell out of trying to funnel it in there, plus you can pre-measure your ounces.