I just bought these valve extenders:
Sorry, Amazon Germany, but you will find them everywhere.
These extenders have a pin inside that goes through their whole length. This pin will open the tire valve when you attach a pump hose, because it will push in and open the valve. This means that, after filling up, you can quickly tear off the hose without losing any significant amount of air. Then you can unscrew the extender as slowly as you like, because the tire valve is already closed.
Avoid pump hoses that are screwed on. They make it impossible to keep any pressure precisely, because while you unscrew the hose, you lose an indeterminate amount of air. If you have a screw-on pump in your car, buy something like this, which you can remove in a split second: