Nothing wrong with the braided extensions, as long as you make sure and get ones that are AIRLESS. Meaning, no air pressure in the extension except when you attach a gauge or air hose. With those, it doesn't matter if the extension works loose, you won't lose any air since there is no air in them (extensions) to lose. I've been using those for years, they work great.
Have used the Borg dually solid valve stem replacements, too. Never could understand why, but they intermittently leaked air soo much, I finally gave up on them and went back to the braided extensions. Never a problem again. The U shaped ones that Borg makes for the outer duals work great, but something about those looong stem valves for the inner, they just would not hold air.
I'd recommend extensions, as long as you make sure whatever extensions you get are airless.