A little confused, but most times a sump is in place for a reason, and the pump sits, there for years if need, just in case.So, as far as a not so permanent installation, you want to just pump some water from the pit when you feel like it, without say a permanent drain pipe or pump in place? Most decent pumps have an auto start as the level comes to an appropriate, or set level, and pump into a drain pipe/outside via a garden hose (on a small volume of water) or through an 1 1/2" flex hose to a drain. I have a 1/2 hp pedestal type pump (in my seasonal home) with adjustable float ( toilet tank style float) that pumps for about 15 seconds when I have a set level in my pit, through a 1 1/2" flex pipe to the sewer pipe via washer drain.
Because I don't use the washer drain, it takes the ground water away fine, but it's nice to know it works when the level creeps back up as the snow melts and the ground gets saturated. If you live in an area prone to water issues, check out your neighbours, I would pipe it in ( even to an outside drain source) and leave it alone, it's there for a reason.