It is no 'new' tech tip but I just bought one so I figure if it's new to me it may be news to others. What would ease the pain is a temporary 90 degeree air valve with internal pressure valve to prevent air loss during install/removal. And darned if they don't make one :

Under $15 from a a variety of online sources - here is just one -
http://trekdg.com/product/topeak-pressu ... aQodNo0Alw" onclick="window.open(this.href);return false;
It would imbalance the wheel to leave it in place all the time so I plan to carry it in one of the storage pockets on the bike and screw it in as needed. I still end up on the ground on my side trying to do the rear wheel - lol - but it should make the task much easier.