Very doable for a DIY'er. Head pressure isn't going to factor the same way as a constant flow pumping situation since you'll be using a pressure tank to generate the pressure during flow.
The shur-flo pumps that i'm referring to are going to be similar to the pump that would be used in a small RV for water supply. They come with an internal pressure switch that will deactivate the pump at typical line pressure. Something along the lines of 40-70 psi.
The pump isn't able to supply the 1/2 inch line at the same flow as a house supply so we also tee in a small captive bladder pressure tank (1-2 gallon or enough to supply just more than one flush).
The toilet gets flushed and the pressurized storage from the tank supplies the replacement water for the back of the toilet tank. At the lowering of pressure the pump turns on refilling the pressure tank. Pressure builds back up to the set point of the pressure switch on the pump.
Toilet's are a good consumption point for this waste water since it will be high in mineral content and they aren't too finicky. Nor do they tend to suffer from mineral build up.
Enjoy!
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