The 1080s shouldn't be any harder to use with an extender than any other deep wheel (ex. a 404). Some thoughts:
-Put teflon plumber's tape on the valve stem so the extender seals well. Put some on your spare tubes as well. This helps apply enough pressure when you start pumping to push the valve open.
-Make sure the valve nut is fully unscrewed, then crimp it (or a drop if super glue) to make sure it never screws closed.
-Use a thin allen wrench (or a paper clip) to depress/"crack" the valve and break the stiction before pumping.
-Consider removable core tubes and extenders that have their own valve out at the tip. This way you can crack the valve with your thumb.
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