That should work, the only thing to watch out for is the aqualift has a max lift pressure it can handle, i think it's like 13" or so.

Our RO/DI has an automatic shut off built in that turns the unit off when the output line pressure reaches a certain point. So when I need to fill the resivoir every 4-5 days or so I just open the ball valve and the float stops it when it's full, then I close the valve until the next time, most of the time I just let it run overnight and shut it off in the morning. Same thing with my other water making activities in the basement.

We tend to really beat up our filters.... it's genreally running 4-5 days a week solid.