Hm, with a pump and maybe even adding a heater, there isn't too much difference between your water holding tank and a sumpless/skimmerless tank is there?
As long as the beneficial bacteria aren't given the opportunity to die I don't see a problem. People store SW/FW in huge barrels for weeks at a time with only a power head and a heater.
To be cautious, since no one is still 100% sure of anything, when you are ready to do your transfer go slowly. Do you mix with new water, break out your chemistry set, make sure parameters are in check and there you go.
I some times shut my sump down for weeks at a time, and just add on a bit of flow and a heater, just so that when I turn it back on it wont be a temp shock. Before I turn the pump back on, I take maybe a gallon on water from the display and add it to the sump and let that swirl around, then add in 1-2 gallons of new RO water (top off plus any dosings).
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