IMO, putting an aerator inline of an impeller is going to be a 0 net gain. The aerator is going slow the flow of the impeller pump, only to increase the flow after it. Impeller pumps are not effected much by that distance or a little lift, what size sacs are you filling and how much longer is it tacking to fill the bow?
Yes, an aerator will pump water to a bow sac. Its been done by many manufacturers of the years, as well as plenty of DIY'rs. Yes, it will loose some flow to head-pressure, but it will work just fine.
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