I also want a multipurpose tool, so I get a few parts that slip fit together and then mod it to fit whatever the situation. First is to get a real-start siphon that doesn't require sucking or fussinf will filling. A squeeze bulb built in with a short portion of large diameter and a screen (removable) is cheap and easy to get on E-bay for 5-10 shipped.
Search aquarium siphon and dozens of options come up.
But to make it versatile, I cut and fit a few parts together so that I can make a press fit which is secure enough but still easy to change out as needed. Like when I want to move small fry, I don't want them going though the squeeze bulb, so I pull it off. The screen at the front is a great option as sometimes I want to get down and suck dirt out of the gravel so the screen is on, just in case a fish gets too close.
Adding various lengths of clear tubing gets me different lengths to reach different tanks in different rooms.
The python type gizmos are not flexible enough to make them a value for my uses and they break really easy, while the $5 cheapy has only failed once in ten years of pretty heavy use. I use a pump in the reserve water barrel for refills.
Linking to e-bay not allowed. Sorry, have to do the search alone!