here is my .02 cents...
ok, you don't need the large tank, just run the line from the bladder tank to the float valve on the sump, as the evaporation is very slow, and the bladder tank should have about 12psi of air when empty, and should have no problem pushing water that far.
the problem I see on the booster pump, is that no float valve will overpower the 60psi the booster pump will provide, so you will have an overfilled sump.
and the auto shutoff valve should keep the system off, unless the pressure drops enough from the tank.
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